Benchmark: Custom pluck test vs JS map vs lodash map

Custom pluck test vs JS map vs lodash map (version: 3)

Testing a functional programming method 'pluck'. This is an in-progress test. Taken from lodash source code, using the Array constructor to make an Array of a specified length, seems to have a considerable impact on performance. In my simple pluck implementation, not using the constructor e.g. const plucked = [], was considerably slower.

Comparing performance of: my pluck function with skipNone vs native JS map and filter vs lodash _.map and iteratee vs my pluck function without skipNone vs native JS map vs lodash _.map

Created: 5 days ago by: Registered User

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HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

const locations = [
    {'county': 'Mid Glamorgan', 'town': 'Aberdare'},
    {'county': 'Aberdeenshire', 'town': 'Aberdeen'},
    {'county': 'Gwynedd', 'town': 'Aberdovey'},
    {'county': 'Gwent', 'town': 'Abergavenny'},
    {'county': 'Clwyd', 'town': 'Abergele'},
    {'county': 'Gwent', 'town': 'Abertillery'},
    {'county': 'Dyfed', 'town': 'Aberystwyth'},
    {'county': 'Oxfordshire', 'town': 'Abingdon'},
    {'county': 'Lancashire', 'town': 'Accrington'},
    {'county': 'Lanarkshire', 'town': 'Airdrie'},
    {'county': 'Warwickshire', 'town': 'Alcester'},
    {'county': 'Suffolk', 'town': 'Aldeburgh'},
    {'county': 'Cheshire', 'town': 'Alderley Edge'},
    {'county': 'Hampshire', 'town': 'Aldershot'},
    {'county': 'Derbyshire', 'town': 'Alfreton'},
    {'county': 'Ross-shire', 'town': 'Alness'},
    {'county': 'Northumberland', 'town': 'Alnwick'},
    {'county': 'Hampshire', 'town': 'Alresford'},
    {'county': 'Cumbria', 'town': 'Alston'},
    {'county': 'Hampshire', 'town': 'Alton'},
    {'county': 'Cheshire', 'town': 'Altrincham'},
    {'county': 'Cumbria', 'town': 'Ambleside'},
    {'county': 'Buckinghamshire', 'town': 'Amersham'},
    {'county': 'Wiltshire', 'town': 'Amesbury'},
    {'county': 'Carmarthenshire', 'town': 'Ammanford'},
    {'county': 'Hampshire', 'town': 'Andover'},
    {'county': 'Fife', 'town': 'Anstruther'},
    {'county': 'Co Antrim', 'town': 'Antrim'},
    {'county': 'Cumbria', 'town': 'Appleby-in-Westmorland'},
    {'county': 'Angus', 'town': 'Arbroath'},
    {'county': 'Ayrshire', 'town': 'Ardrossan'},
    {'county': 'Co Armagh', 'town': 'Armagh'},
    {'county': 'Gwynedd', 'town': 'Arthog'},
    {'county': 'West Sussex', 'town': 'Arundel'},
    {'county': 'Berkshire', 'town': 'Ascot'},
    {'county': 'Derbyshire', 'town': 'Ashbourne'},
    {'county': 'Devon', 'town': 'Ashburton'},
    {'county': 'Kent', 'town': 'Ashford'},
    {'county': 'Middlesex', 'town': 'Ashford'},
    {'county': 'Northumberland', 'town': 'Ashington'},
    {'county': 'Surrey', 'town': 'Ashtead'},
    {'county': 'Greater Manchester', 'town': 'Ashton-under-Lyne'},
    {'county': 'Norfolk', 'town': 'Attleborough'},
    {'county': 'Inverness-shire', 'town': 'Aviemore'},
    {'county': 'Devon', 'town': 'Axminster'},
    {'county': 'Buckinghamshire', 'town': 'Aylesbury'},
    {'county': 'Ayrshire', 'town': 'Ayr'},
    {'county': 'Gwynedd', 'town': 'Bala'},
    {'county': 'Hertfordshire', 'town': 'Baldock'},
    {'county': 'Argyll', 'town': 'Ballachulish'},
    {'county': 'Co Antrim', 'town': 'Ballycastle'},
    {'county': 'Co Antrim', 'town': 'Ballyclare'},
    {'county': 'Co Antrim', 'town': 'Ballymena'},
    {'county': 'Co Antrim', 'town': 'Ballymoney'},
    {'county': 'Northumberland', 'town': 'Bamburgh'},
    {'county': 'Devon', 'town': 'Bamstaple'},
    {'county': 'Co Down', 'town': 'Banbridge'},
    {'county': 'Oxfordshire', 'town': 'Banbury'},
    {'county': 'Kincardineshire', 'town': 'Banchory'},
    {'county': 'Aberdeenshire', 'town': 'Banff'},
    {'county': 'Co Down', 'town': 'Bangor'},
    {'county': 'Gwynedd', 'town': 'Bangor'},
    {'county': 'Surrey', 'town': 'Banstead'},
    {'county': 'Essex', 'town': 'Barking'},
    {'county': 'Gwynedd', 'town': 'Barmouth'},
    {'county': 'Co Durham', 'town': 'Barnard Castle'},
    {'county': 'Hertfordshire', 'town': 'Barnet'},
    {'county': 'South Yorkshire', 'town': 'Barnsley'},
    {'county': 'Devon', 'town': 'Barnstaple'},
    {'county': 'South Glamorgan', 'town': 'Barry'},
    {'county': 'Cumbria', 'town': 'Barrow-in Furness'},
    {'county': 'South Humberside', 'town': 'Barton-upon-Humber'},
    {'county': 'Essex', 'town': 'Basildon'},
    {'county': 'Hampshire', 'town': 'Basingstoke'},
    {'county': 'Avon', 'town': 'Bath'},
    {'county': 'West Lothian', 'town': 'Bathgate'},
    {'county': 'East Sussex', 'town': 'Battle'},
    {'county': 'Gwynedd', 'town': 'Beaumaris'},
    {'county': 'Suffolk', 'town': 'Beccles'},
    {'county': 'Kent', 'town': 'Beckenham'},
    {'county': 'North Yorkshire', 'town': 'Bedale'},
    {'county': 'Bedfordshire', 'town': 'Bedford'},
    {'county': 'Belfast', 'town': 'Belfast'},
    {'county': 'Kent', 'town': 'Belvedere'},
    {'county': 'Essex', 'town': 'Benneet'},
    {'county': 'Hertfordshire', 'town': 'Berkhamsted'},
    {'county': 'Northumberland', 'town': 'Berwick-on-Tweed'},
    {'county': 'Conwy', 'town': 'Betws-y-Coed'},
    {'county': 'North Humberside', 'town': 'Beverley'},
    {'county': 'Worcestershire', 'town': 'Bewdley'},
    {'county': 'East Sussex', 'town': 'Bexhill-on-Sea'},
    {'county': 'Oxfordshire', 'town': 'Bicester'},
    {'county': 'Devon', 'town': 'Bideford'},
    {'county': 'Lanarkshire', 'town': 'Biggar'},
    {'county': 'Bedfordshire', 'town': 'Biggleswade'},
    {'county': 'Essex', 'town': 'Billericay'},
    {'county': 'West Sussex', 'town': 'Billingshurst'},
    {'county': 'West Yorkshire', 'town': 'Bingley'},
    {'county': 'Merseyside', 'town': 'Birkenhead'},
    {'county': 'West Midlands', 'town': 'Birmingham'},
    {'county': 'Co Durham', 'town': 'Bishop Auckland'},
    {'county': 'Shropshire', 'town': 'Bishops Castle'},
    {'county': 'Hertfordshire', 'town': 'Bishop\'s Stortford'},
    {'county': 'Hampshire', 'town': 'Bishops Waltham'},
    {'county': 'Lancashire', 'town': 'Blackburn'},
    {'county': 'Lancashire', 'town': 'Blackpool'},
    {'county': 'Gwynedd', 'town': 'Blaenau Ffestiniog'},
    {'county': 'Perthshire', 'town': 'Blairgowrie'},
    {'county': 'Dorset', 'town': 'Blandford Forum'},
    {'county': 'Tyne & Wear', 'town': 'Blaydon-on-Tyne'},
    {'county': 'Cornwall', 'town': 'Bodmin'},
    {'county': 'West Sussex', 'town': 'Bognor Regis'},
    {'county': 'Tyne & Wear', 'town': 'Boldon Colliery'},
    {'county': 'Lancashire', 'town': 'Bolton'},
    {'county': 'Midlothian', 'town': 'Bonnyrigg'},
    {'county': 'Merseyside', 'town': 'Bootle'},
    {'county': 'Hampshire', 'town': 'Bordon'},
    {'county': 'Hertfordshire', 'town': 'Borehamwood'},
    {'county': 'Lincolnshire', 'town': 'Boston'},
    {'county': 'West Lothian', 'town': 'Botness'},
    {'county': 'Lincolnshire', 'town': 'Bourne'},
    {'county': 'Dorset', 'town': 'Bournemouth'},
    {'county': 'Northamptonshire', 'town': 'Brackley'},
    {'county': 'Berkshire', 'town': 'Bracknell'},
    {'county': 'West Yorkshire', 'town': 'Bradford'},
    {'county': 'Essex', 'town': 'Braintree'},
    {'county': 'Cumbria', 'town': 'Brampton'},
    {'county': 'Devon', 'town': 'Braunton'},
    {'county': 'Powys', 'town': 'Brecon'},
    {'county': 'Middlesex', 'town': 'Brentford'},
    {'county': 'Essex', 'town': 'Brentwood'},
    {'county': 'Mid Glamorgan', 'town': 'Bridgend'},
    {'county': 'Shropshire', 'town': 'Bridgnorth'},
    {'county': 'Somerset', 'town': 'Bridgwater'},
    {'county': 'North Humberside', 'town': 'Bridlington'},
    {'county': 'Dorset', 'town': 'Bridport'},
    {'county': 'Lincolnshire', 'town': 'Brigg'},
    {'county': 'West Yorkshire', 'town': 'Brighouse'},
    {'county': 'East Sussex', 'town': 'Brighton'},
    {'county': 'Avon', 'town': 'Bristol'},
    {'county': 'Devon', 'town': 'Brixham'},
    {'county': 'Isle of Skye', 'town': 'Broadford'},
    {'county': 'Kent', 'town': 'Broadstairs'},
    {'county': 'Hereford & Worcester', 'town': 'Broadway'},
    {'county': 'Hampshire', 'town': 'Brockenhurst'},
    {'county': 'Isle of Arran', 'town': 'Brodick'},
    {'county': 'Kent', 'town': 'Bromley'},
    {'county': 'Hereford & Worcester', 'town': 'Bromsgrove'},
    {'county': 'Norfolk', 'town': 'Brooke'},
    {'county': 'West Lothian', 'town': 'Broxburn'},
    {'county': 'Devon', 'town': 'Buckfastleigh'},
    {'county': 'Essex', 'town': 'Buckhurst Hill'},
    {'county': 'Banffshire', 'town': 'Buckie'},
    {'county': 'Buckinghamshire', 'town': 'Buckingham'},
    {'county': 'Cornwall', 'town': 'Bude'},
    {'county': 'Devon', 'town': 'Budleigh Salterton'},
    {'county': 'Powys', 'town': 'Builth Wells'},
    {'county': 'Isle of Mull', 'town': 'Bunessan'},
    {'county': 'Suffolk', 'town': 'Bungay'},
    {'county': 'West Sussex', 'town': 'Burgess Hill'},
    {'county': 'Somerset', 'town': 'Burnham-on-Sea'},
    {'county': 'Lancashire', 'town': 'Burnley'},
    {'county': 'Staffordshire', 'town': 'Burton-on-Trent'},
    {'county': 'Lancashire', 'town': 'Bury'},
    {'county': 'Suffolk', 'town': 'Bury St Edmunds'},
    {'county': 'Co Antrim', 'town': 'Bushmills'},
    {'county': 'Derbyshire', 'town': 'Buxton'},
    {'county': 'Gwynedd', 'town': 'Caernarvon'},
    {'county': 'Mid Glamorgan', 'town': 'Caerphilly'},
    {'county': 'Wiltshire', 'town': 'Calne'},
    {'county': 'Surrey', 'town': 'Camberley'},
    {'county': 'Cambridgeshire', 'town': 'Cambridge'},
    {'county': 'Cornwall', 'town': 'Camelford'},
    {'county': 'Argyll', 'town': 'Campbeltown'},
    {'county': 'Staffordshire', 'town': 'Cannock'},
    {'county': 'Kent', 'town': 'Canterbury'},
    {'county': 'South Glamorgan', 'town': 'Cardiff'},
    {'county': 'Dyfed', 'town': 'Cardigan'},
    {'county': 'Cumbria', 'town': 'Carlisle'},
    {'county': 'Isle of Lewis', 'town': 'Carloway'},
    {'county': 'Lanarkshire', 'town': 'Carluke'},
    {'county': 'Dyfed', 'town': 'Carmarthen'},
    {'county': 'Lancashire', 'town': 'Carnforth'},
    {'county': 'Co Antrim', 'town': 'Carrickfergus'},
    {'county': 'Surrey', 'town': 'Carshalton'},
    {'county': 'Kirkcudbrightshire', 'town': 'Castle Douglas'},
    {'county': 'Co Tyrone', 'town': 'Castlederg'},
    {'county': 'Isle of Man', 'town': 'Castletown'},
    {'county': 'Co Down', 'town': 'Castlewellan'},
    {'county': 'Surrey', 'town': 'Caterham'},
    {'county': 'Gwynedd', 'town': 'Cemmaes Bay'},
    {'county': 'Gwynedd', 'town': 'Cemmaes Road'},
    {'county': 'Dorset', 'town': 'Cerne Abbas'},
    {'county': 'Somerset', 'town': 'Chard'},
    {'county': 'Kent', 'town': 'Chatham'},
    {'county': 'Cambridgeshire', 'town': 'Chatteris'},
    {'county': 'Cheshire', 'town': 'Cheadle'},
    {'county': 'Surrey', 'town': 'Cheam'},
    {'county': 'Somerset', 'town': 'Cheddar'},
    {'county': 'Essex', 'town': 'Chelmsford'},
    {'county': 'Gloucestershire', 'town': 'Cheltenham'},
    {'county': 'Gwent', 'town': 'Chepstow'},
    {'county': 'Surrey', 'town': 'Chertsey'},
    {'county': 'Buckinghamshire', 'town': 'Chesham'},
    {'county': 'Cheshire', 'town': 'Chester'},
    {'county': 'Co Durham', 'town': 'Chester-le-Street'},
    {'county': 'Derbyshire', 'town': 'Chesterfield'},
    {'county': 'West Sussex', 'town': 'Chichester'},
    {'county': 'Wiltshire', 'town': 'Chippenham'},
    {'county': 'Oxfordshire', 'town': 'Chipping Norton'},
    {'county': 'Gloucestershire', 'town': 'Chipping Sodbury'},
    {'county': 'Lancashire', 'town': 'Chorley'},
    {'county': 'Dorset', 'town': 'Christchurch'},
    {'county': 'Shropshire', 'town': 'Church Stretton'},
    {'county': 'Gloucestershne', 'town': 'Cinderford'},
    {'county': 'Gloucestershire', 'town': 'Cirencester'},
    {'county': 'Essex', 'town': 'Clacton-on-Sea'},
    {'county': 'South Humberside', 'town': 'Cleethorpes'},
    {'county': 'Avon', 'town': 'Clevedon'},
    {'county': 'Lancashire', 'town': 'Clitheroe'},
    {'county': 'Co Tyrone', 'town': 'Clogher'},
    {'county': 'Northamptonshire', 'town': 'Clopton'},
    {'county': 'Leicestershire', 'town': 'Coalville'},
    {'county': 'Lanarkshire', 'town': 'Coatbridge'},
    {'county': 'Surrey', 'town': 'Cobham'},
    {'county': 'Cumbria', 'town': 'Cockermouth'},
    {'county': 'Essex', 'town': 'Colchester'},
    {'county': 'Warwickshire', 'town': 'Coleshill'},
    {'county': 'Co Londonderry', 'town': 'Coleraine'},
    {'county': 'Clwyd', 'town': 'Colwyn Bay'},
    {'county': 'Cheshire', 'town': 'Congleton'},
    {'county': 'Cumbria', 'town': 'Coniston'},
    {'county': 'Co Durham', 'town': 'Consett'},
    {'county': 'Gwynedd', 'town': 'Conwy'},
    {'county': 'Co Tyrone', 'town': 'Cookstown'},
    {'county': 'Lancashire', 'town': 'Coppull'},
    {'county': 'Northumberland', 'town': 'Corbridge'},
    {'county': 'Northamptonshire', 'town': 'Corby'},
    {'county': 'Clwyd', 'town': 'Corwen'},
    {'county': 'Surrey', 'town': 'Coulsdon'},
    {'county': 'West Midlands', 'town': 'Coventry'},
    {'county': 'Co Armagh', 'town': 'Craigavon'},
    {'county': 'Northumberland', 'town': 'Cramlington'},
    {'county': 'Kent', 'town': 'Cranbrook'},
    {'county': 'Surrey', 'town': 'Cranleigh'},
    {'county': 'Shropshire', 'town': 'Craven Arms'},
    {'county': 'West Sussex', 'town': 'Crawley'},
    {'county': 'Devon', 'town': 'Crediton'},
    {'county': 'Cheshire', 'town': 'Crewe'},
    {'county': 'Perthshire', 'town': 'Crieff'},
    {'county': 'Norfolk', 'town': 'Cromer'},
    {'county': 'East Sussex', 'town': 'Crowborough'},
    {'county': 'Inverness-shire', 'town': 'Croy'},
    {'county': 'Surrey', 'town': 'Croydon'},
    {'county': 'Co Antrim', 'town': 'Crumlin'},
    {'county': 'Devon', 'town': 'Cullompton'},
    {'county': 'East Ayrshire', 'town': 'Cumnock'},
    {'county': 'Fife', 'town': 'Cupar'},
    {'county': 'Gwent', 'town': 'Cwmbran'},
    {'county': 'Essex', 'town': 'Dagenham'},
    {'county': 'Kirkcudbrightshire', 'town': 'Dalbeattie'},
    {'county': 'Argyll', 'town': 'Dalmally'},
    {'county': 'Ayrshire', 'town': 'Dalry'},
    {'county': 'Co Durham', 'town': 'Darlington'},
    {'county': 'Kent', 'town': 'Dartford'},
    {'county': 'Ayrshire', 'town': 'Darvel'},
    {'county': 'Northamptonshire', 'town': 'Daventry'},
    {'county': 'Kent', 'town': 'Deal'},
    {'county': 'Clwyd', 'town': 'Deeside'},
    {'county': 'Derbyshire', 'town': 'Derby'},
    {'county': 'Norfolk', 'town': 'Dereham'},
    {'county': 'Wiltshire', 'town': 'Devizes'},
    {'county': 'West Yorkshire', 'town': 'Dewsbury'},
    {'county': 'Oxfordshire', 'town': 'Didcot'},
    {'county': 'South Glamorgan', 'town': 'Dinas Powis'},
    {'county': 'Ross-shire', 'town': 'Dingwall'},
    {'county': 'Norfolk', 'town': 'Diss'},
    {'county': 'Gwynedd', 'town': 'Dolgellau'},
    {'county': 'South Yorkshire', 'town': 'Doncaster'},
    {'county': 'Dorset', 'town': 'Dorchester'},
    {'county': 'Surrey', 'town': 'Dorking'},
    {'county': 'Sutherland', 'town': 'Dornoch'},
    {'county': 'Isle of Man', 'town': 'Douglas'},
    {'county': 'Kent', 'town': 'Dover'},
    {'county': 'Norfolk', 'town': 'Downham Market'},
    {'county': 'Co Down', 'town': 'Downpatrick'},
    {'county': 'North Humberside', 'town': 'Driffield'},
    {'county': 'Hereford & Worcester', 'town': 'Droitwich'},
    {'county': 'Co Down', 'town': 'Dromore'},
    {'county': 'West Midlands', 'town': 'Dudley'},
    {'county': 'Somerset', 'town': 'Dulverton'},
    {'county': 'Dunbartonshire', 'town': 'Dumbarton'},
    {'county': 'Dumfriesshire', 'town': 'Dumfries'},
    {'county': 'East Lothian', 'town': 'Dunbar'},
    {'county': 'Perthshire', 'town': 'Dunblane'},
    {'county': 'Angus', 'town': 'Dundee'},
    {'county': 'Fife', 'town': 'Dunfermline'},
    {'county': 'Co Tyrone', 'town': 'Dungannon'},
    {'county': 'Perthshire', 'town': 'Dunkeld'},
    {'county': 'Essex', 'town': 'Dunmow'},
    {'county': 'Belfast', 'town': 'Dunmurry'},
    {'county': 'Argyll', 'town': 'Dunoon'},
    {'county': 'Berwickshire', 'town': 'Duns'},
    {'county': 'Bedfordshire', 'town': 'Dunstable'},
    {'county': 'Co Durham', 'town': 'Durham'},
    {'county': 'Gloucestershire', 'town': 'Dursley'},
    {'county': 'North Yorkshire', 'town': 'Easingwold'},
    {'county': 'West Sussex', 'town': 'East Grinstead'},
    {'county': 'South Lanarkshire', 'town': 'East Kilbride'},
    {'county': 'Surrey', 'town': 'East Molesey'},
    {'county': 'East Sussex', 'town': 'Eastbourne'},
    {'county': 'Hampshire', 'town': 'Eastleigh'},
    {'county': 'Kent', 'town': 'Ebbsfleet'},
    {'county': 'Gwent', 'town': 'Ebbw Vale'},
    {'county': 'Kent', 'town': 'Edenbridge'},
    {'county': 'Middlesex', 'town': 'Edgware'},
    {'county': 'Edinburgh', 'town': 'Edinburgh'},
    {'county': 'Surrey', 'town': 'Egham'},
    {'county': 'Morayshire', 'town': 'Elgin'},
    {'county': 'Cheshire', 'town': 'Ellesmere Port'},
    {'county': 'Aberdeenshire', 'town': 'Ellon'},
    {'county': 'Cambridgeshire', 'town': 'Ely'},
    {'county': 'Hampshire', 'town': 'Emsworth'},
    {'county': 'Middlesex', 'town': 'Enfeld'},
    {'county': 'Co Fermanagh', 'town': 'Enniskillen'},
    {'county': 'Essex', 'town': 'Epping'},
    {'county': 'Surrey', 'town': 'Epsom'},
    {'county': 'Kent', 'town': 'Erith'},
    {'county': 'Surrey', 'town': 'Esher'},
    {'county': 'Worcestershire', 'town': 'Evesham'},
    {'county': 'Devon', 'town': 'Exeter'},
    {'county': 'Devon', 'town': 'Exmouth'},
    {'county': 'Norfolk', 'town': 'Fakenham'},
    {'county': 'Stirlingshire', 'town': 'Falkirk'},
    {'county': 'Cornwall', 'town': 'Falmouth'},
    {'county': 'Hampshire', 'town': 'Fareham'},
    {'county': 'Oxfordshire', 'town': 'Faringdon'},
    {'county': 'Hampshire', 'town': 'Farnborough'},
    {'county': 'Surrey', 'town': 'Farnham'},
    {'county': 'Suffolk', 'town': 'Felixstowe'},
    {'county': 'Dyfed', 'town': 'Fishguard'},
    {'county': 'Co Tyrone', 'town': 'Fivemiletown'},
    {'county': 'Hampshire', 'town': 'Fleet'},
    {'county': 'Lancashire', 'town': 'Fleetwood'},
    {'county': 'Clwyd', 'town': 'Flint'},
    {'county': 'Kent', 'town': 'Folkestone'},
    {'county': 'Angus', 'town': 'Forfar'},
    {'county': 'Inverness-shire', 'town': 'Fort William'},
    {'county': 'Ross-shire', 'town': 'Fortrose'},
    {'county': 'Cornwall', 'town': 'Fowey'},
    {'county': 'Aberdeenshire', 'town': 'Fraserburgh'},
    {'county': 'Isle of Wight', 'town': 'Freshwater'},
    {'county': 'Essex', 'town': 'Frinton-on-Sea'},
    {'county': 'Somerset', 'town': 'Frome'},
    {'county': 'Lincolnshire', 'town': 'Gainsborough'},
    {'county': 'Ross-shire', 'town': 'Gairloch'},
    {'county': 'Selkirkshire', 'town': 'Galasheils'},
    {'county': 'Lancashire', 'town': 'Garstang'},
    {'county': 'Tyne & Wear', 'town': 'Gateshead'},
    {'county': 'Buckinghamshire', 'town': 'Gerrards Cross'},
    {'county': 'Dorset', 'town': 'Gillingham'},
    {'county': 'Kent', 'town': 'Gillingham'},
    {'county': 'South Ayrshire', 'town': 'Girvan'},
    {'county': 'Rotherham', 'town': 'Glamorgan'},
    {'county': 'Glasgow', 'town': 'Glasgow'},
    {'county': 'Somerset', 'town': 'Glastonbury'},
    {'county': 'Fife', 'town': 'Glenrothes'},
    {'county': 'Derbyshire', 'town': 'Glossop'},
    {'county': 'Gloucestershire', 'town': 'Gloucester'},
    {'county': 'Surrey', 'town': 'Godalming'},
    {'county': 'Surrey', 'town': 'Godstone'},
    {'county': 'East Riding of Yorkshire', 'town': 'Goole'},
    {'county': 'Cumbria', 'town': 'Gosforth'},
    {'county': 'Hampshire', 'town': 'Gosport'},
    {'county': 'Cumbria', 'town': 'Grange-over-Sands'},
    {'county': 'Midlothian', 'town': 'Grangemouth'},
    {'county': 'Lincolnshire', 'town': 'Grantham'},
    {'county': 'Kent', 'town': 'Gravesend'},
    {'county': 'Essex', 'town': 'Grays Thurrock'},
    {'county': 'Essex', 'town': 'Great Dunmow'},
    {'county': 'Buckinghamshire', 'town': 'Great Missenden'},
    {'county': 'Norfolk', 'town': 'Great Yarmouth'},
    {'county': 'Middlesex', 'town': 'Greenford'},
    {'county': 'Renfrewshire', 'town': 'Greenock'},
    {'county': 'Dumfriesshire', 'town': 'Gretna'},
    {'county': 'South Humberside', 'town': 'Grimsby'},
    {'county': 'Channel Islands', 'town': 'Guernsey'},
    {'county': 'Surrey', 'town': 'Guildford'},
    {'county': 'North Yorkshire', 'town': 'Guisborough'},
    {'county': 'West Yorkshire', 'town': 'Guiseley'},
    {'county': 'East Lothian', 'town': 'Gullane'},
    {'county': 'Lanark shire', 'town': 'Hamilton'},
    {'county': 'East Lothian', 'town': 'Haddington'},
    {'county': 'East Sussex', 'town': 'Hailsham'},
    {'county': 'West Midlands', 'town': 'Halesowen'},
    {'county': 'West Yorkshire', 'town': 'Halifax'},
    {'county': 'Essex', 'town': 'Halstead'},
    {'county': 'Northumberland', 'town': 'Haltwhistle'},
    {'county': 'Middlesex', 'town': 'Hampton'},
    {'county': 'Essex', 'town': 'Harlow'},
    {'county': 'Hertfordshire', 'town': 'Harpenden'},
    {'county': 'North Yorkshire', 'town': 'Harrogate'},
    {'county': 'Middlesex', 'town': 'Harrow'},
    {'county': 'Cleveland', 'town': 'Hartlepool'},
    {'county': 'Essex', 'town': 'Harwich'},
    {'county': 'Surrey', 'town': 'Haslemere'},
    {'county': 'West Sussex', 'town': 'Hassocks'},
    {'county': 'East Sussex', 'town': 'Hastings'},
    {'county': 'Hertfordshire', 'town': 'Hatfield'},
    {'county': 'Derbyshire', 'town': 'Hathersage'},
    {'county': 'Hampshire', 'town': 'Havant'},
    {'county': 'Pembrokeshire', 'town': 'Haverfordwest'},
    {'county': 'Suffolk', 'town': 'Haverhill'},
    {'county': 'Roxburghshire', 'town': 'Hawick'},
    {'county': 'Cumbria', 'town': 'Hawkshead'},
    {'county': 'Powys', 'town': 'Hay-on-Wye'},
    {'county': 'Middlesex', 'town': 'Hayes'},
    {'county': 'Hampshire', 'town': 'Hayling Island'},
    {'county': 'West Sussex', 'town': 'Haywards Heath'},
    {'county': 'Derbyshire', 'town': 'Heanor'},
    {'county': 'East Sussex', 'town': 'Heathfield'},
    {'county': 'West Yorkshire', 'town': 'Hebden Bridge'},
    {'county': 'Dunbartonshire', 'town': 'Helensburgh'},
    {'county': 'North Yorkshire', 'town': 'Helmsley'},
    {'county': 'Cornwall', 'town': 'Helston'},
    {'county': 'Hertfordshire', 'town': 'Hemel Hempstead'},
    {'county': 'West Sussex', 'town': 'Henfield'},
    {'county': 'Oxfordshire', 'town': 'Henley-on-Thames'},
    {'county': 'Hereford & Worcester', 'town': 'Hereford'},
    {'county': 'Kent', 'town': 'Herne Bay'},
    {'county': 'Hertfordshire', 'town': 'Hertford'},
    {'county': 'North Humberside', 'town': 'Hessle'},
    {'county': 'Northumberland', 'town': 'Hexham'},
    {'county': 'Lancashire', 'town': 'Heywood'},
    {'county': 'Buckinghamshire', 'town': 'High Wycombe'},
    {'county': 'Somerset', 'town': 'Highbridge'},
    {'county': 'Co Down', 'town': 'Hillsborough'},
    {'county': 'Leicestershire', 'town': 'Hinckley'},
    {'county': 'Surrey', 'town': 'Hindhead'},
    {'county': 'Hertfordshire', 'town': 'Hitchin'},
    {'county': 'Essex', 'town': 'Hockley'},
    {'county': 'Hertfordshire', 'town': 'Hoddesdon'},
    {'county': 'Lincolnshire', 'town': 'Holbeach'},
    {'county': 'Cheshire', 'town': 'Holmes Chapel'},
    {'county': 'Devon', 'town': 'Holsworthy'},
    {'county': 'Norfolk', 'town': 'Holt'},
    {'county': 'Gwynedd', 'town': 'Holyhead'},
    {'county': 'Co Down', 'town': 'Holywood'},
    {'county': 'Lincolnshire', 'town': 'Honington'},
    {'county': 'Devon', 'town': 'Honiton'},
    {'county': 'Hampshire', 'town': 'Hook'},
    {'county': 'Surrey', 'town': 'Horley'},
    {'county': 'Lancashire', 'town': 'Hornby'},
    {'county': 'Essex', 'town': 'Hornchurch'},
    {'county': 'East Riding of Yorkshire', 'town': 'Hornsea'},
    {'county': 'West Sussex', 'town': 'Horsham'},
    {'county': 'Tyne & Wear', 'town': 'Houghton le Spring'},
    {'county': 'Middlesex', 'town': 'Hounslow'},
    {'county': 'East Sussex', 'town': 'Hove'},
    {'county': 'West Yorkshire', 'town': 'Huddersfield'},
    {'county': 'North Humberside', 'town': 'Hull'},
    {'county': 'Berkshire', 'town': 'Hungerford'},
    {'county': 'Norfolk', 'town': 'Hunstanton'},
    {'county': 'Cambridgeshire', 'town': 'Huntingdon'},
    {'county': 'Aberdeenshire', 'town': 'Huntly'},
    {'county': 'Cheshire', 'town': 'Hyde'},
    {'county': 'Kent', 'town': 'Hythe'},
    {'county': 'Essex', 'town': 'Ilford'},
    {'county': 'Devon', 'town': 'Ilfracombe'},
    {'county': 'Derbyshire', 'town': 'Ilkeston'},
    {'county': 'West Yorkshire', 'town': 'Ilkley'},
    {'county': 'South Humberside', 'town': 'Immingham'},
    {'county': 'Essex', 'town': 'Ingatestone'},
    {'county': 'Aberdeenshire', 'town': 'Insch'},
    {'county': 'Argyll', 'town': 'Inveraray'},
    {'county': 'Inverness-shire', 'town': 'Inverness'},
    {'county': 'Aberdeenshire', 'town': 'Inverurie'},
    {'county': 'Isle of Iona', 'town': 'Iona'},
    {'county': 'Staffordshire', 'town': 'Ipstones'},
    {'county': 'Suffolk', 'town': 'Ipswich'},
    {'county': 'Shropshire', 'town': 'Ironbridge'},
    {'county': 'Isle of Wight', 'town': 'Isle of Wight'},
    {'county': 'Middlesex', 'town': 'Isleworth'},
    {'county': 'Channel Islands', 'town': 'Jersey'},
    {'county': 'Renfrewshire', 'town': 'Johnstone'},
    {'county': 'West Yorkshire', 'town': 'Keighley'},
    {'county': 'Roxburghshire', 'town': 'Kelso'},
    {'county': 'Cumbria', 'town': 'Kendal'},
    {'county': 'Warwickshire', 'town': 'Kenilworth'},
    {'county': 'Cumbria', 'town': 'Keswick'},
    {'county': 'Northamptonshire', 'town': 'Kettering'},
    {'county': 'Hereford & Worcester', 'town': 'Kidderminster'},
    {'county': 'Ayrshire', 'town': 'Kilbirnie'},
    {'county': 'Perthshire', 'town': 'Killin'},
    {'county': 'Lincolnshire', 'town': 'Killingholme'},
    {'county': 'Renfrewshire', 'town': 'Kilmacolm'},
    {'county': 'Ayrshire', 'town': 'Kilmarnock'},
    {'county': 'Norfolk', 'town': 'King\'s Lynn'},
    {'county': 'Hertfordshire', 'town': 'Kings Langley'},
    {'county': 'Devon', 'town': 'Kingsbridge'},
    {'county': 'Surrey', 'town': 'Kingston upon Thames'},
    {'county': 'West Midlands', 'town': 'Kingswinford'},
    {'county': 'Herefordshire', 'town': 'Kington'},
    {'county': 'Inverness-shire', 'town': 'Kingussie'},
    {'county': 'Cumbria', 'town': 'Kirkby Stephen'},
    {'county': 'Fife', 'town': 'Kirkcaldy'},
    {'county': 'Northumberland', 'town': 'Kirkwhelpington'},
    {'county': 'Angus', 'town': 'Kirriemuir'},
    {'county': 'Powys', 'town': 'Knighton'},
    {'county': 'Cheshire', 'town': 'Knutsford'},
    {'county': 'Ross-shire', 'town': 'Kyle'},
    {'county': 'Isle of Skye', 'town': 'Kyleakin'},
    {'county': 'Essex', 'town': 'Laindon'},
    {'county': 'Sutherland', 'town': 'Lairg'},
    {'county': 'Ceredigion', 'town': 'Lampeter'},
    {'county': 'Lanarkshire', 'town': 'Lanark'},
    {'county': 'Lancashire', 'town': 'Lancaster'},
    {'county': 'West Sussex', 'town': 'Lancing'},
    {'county': 'Warwickshire', 'town': 'Lapworth'},
    {'county': 'Stirlingshire', 'town': 'Larbert'},
    {'county': 'Caithness', 'town': 'Latheron'},
    {'county': 'Cornwall', 'town': 'Launceston'},
    {'county': 'Warwickshire', 'town': 'Leamington Spa'},
    {'county': 'Surrey', 'town': 'Leatherhead'},
    {'county': 'Hereford & Worcester', 'town': 'Ledbury'},
    {'county': 'West Yorkshire', 'town': 'Leeds'},
    {'county': 'Leicestershire', 'town': 'Leicester'},
    {'county': 'Lancashire', 'town': 'Leigh'},
    {'county': 'Essex', 'town': 'Leigh-on-Sea'},
    {'county': 'Bedfordshire', 'town': 'Leighton Buzzard'},
    {'county': 'Suffolk', 'town': 'Leiston'},
    {'county': 'Hereford & Worcester', 'town': 'Leominster'},
    {'county': 'Isle of Shetland', 'town': 'Lerwick'},
    {'county': 'Hertfordshire', 'town': 'Letchworth'},
    {'county': 'East Sussex', 'town': 'Lewes'},
    {'county': 'North Yorkshire', 'town': 'Leyburn'},
    {'county': 'Lancashire', 'town': 'Leyland'},
    {'county': 'Staffordshire', 'town': 'Lichfield'},
    {'county': 'Surrey', 'town': 'Lightwater'},
    {'county': 'Co Londonderry', 'town': 'Limavady'},
    {'county': 'Lincolnshire', 'town': 'Lincoln'},
    {'county': 'Surrey', 'town': 'Lingfield'},
    {'county': 'Hampshire', 'town': 'Liphook'},
    {'county': 'Co Antrim', 'town': 'Lisburn'},
    {'county': 'Cornwall', 'town': 'Liskeard'},
    {'county': 'Hampshire', 'town': 'Liss'},
    {'county': 'Lancashire', 'town': 'Littleborough'},
    {'county': 'West Sussex', 'town': 'Littlehampton'},
    {'county': 'Merseyside', 'town': 'Liverpool'},
    {'county': 'West Lothian', 'town': 'Livingston'},
    {'county': 'Ceredigion', 'town': 'Llanarth'},
    {'county': 'Gwynedd', 'town': 'Llanbedr'},
    {'county': 'Carmarthenshire', 'town': 'Llandeilo'},
    {'county': 'Carmarthenshire', 'town': 'Llandovery'},
    {'county': 'Powys', 'town': 'Llandrindod Wells'},
    {'county': 'Gwynedd', 'town': 'Llandudno'},
    {'county': 'Dyfed', 'town': 'Llandysul'},
    {'county': 'Dyfed', 'town': 'Llanelli'},
    {'county': 'Clwyd', 'town': 'Llangollen'},
    {'county': 'Powys', 'town': 'Llanidloes'},
    {'county': 'Ceredigion', 'town': 'Llanon'},
    {'county': 'Gwynedd', 'town': 'Llanrwst'},
    {'county': 'South Glamorgan', 'town': 'Llantwit'},
    {'county': 'Dyfed', 'town': 'Llanwrda'},
    {'county': 'Powys', 'town': 'Llanwrtyd Wells'},
    {'county': 'Midlothian', 'town': 'Loanhead'},
    {'county': 'Isle of Uist', 'town': 'Lochboisdale'},
    {'county': 'Ross-shire', 'town': 'Lochcarron'},
    {'county': 'Argyll', 'town': 'Lochgilphead'},
    {'county': 'Renfrewshire', 'town': 'Lochwinnoch'},
    {'county': 'Dumfriesshire', 'town': 'Lockerbie'},
    {'county': 'London', 'town': 'London'},
    {'county': 'Co Londonderry', 'town': 'Londonderry'},
    {'county': 'Leicestershire', 'town': 'Loughborough'},
    {'county': 'Essex', 'town': 'Loughton'},
    {'county': 'Lincolnshire', 'town': 'Louth'},
    {'county': 'Suffolk', 'town': 'Lowestoft'},
    {'county': 'Shropshire', 'town': 'Ludlow'},
    {'county': 'Co Antrim', 'town': 'Lurgan'},
    {'county': 'Bedfordshire', 'town': 'Luton'},
    {'county': 'Leicestershire', 'town': 'Lutterworth'},
    {'county': 'Gloucestershire', 'town': 'Lydney'},
    {'county': 'Hampshire', 'town': 'Lymington'},
    {'county': 'Hampshire', 'town': 'Lyndhurst'},
    {'county': 'Devon', 'town': 'Lynton'},
    {'county': 'Lancashire', 'town': 'Lytham StAnnes'},
    {'county': 'Cheshire', 'town': 'Macclesfield'},
    {'county': 'Powys', 'town': 'Machynlleth'},
    {'county': 'Cambridgeshire', 'town': 'Madingley'},
    {'county': 'Mid Glamorgan', 'town': 'Maesteg'},
    {'county': 'Co Londonderry', 'town': 'Magharafelt'},
    {'county': 'Berkshire', 'town': 'Maidenhead'},
    {'county': 'Kent', 'town': 'Maidstone'},
    {'county': 'Essex', 'town': 'Maldon'},
    {'county': 'Wiltshire', 'town': 'Malmesbury'},
    {'county': 'Cheshire', 'town': 'Malpas'},
    {'county': 'North Yorkshire', 'town': 'Malton'},
    {'county': 'Hereford & Worcester', 'town': 'Malvern'},
    {'county': 'Greater Manchester', 'town': 'Manchester'},
    {'county': 'Nottinghamshire', 'town': 'Mansfield'},
    {'county': 'Cambridgeshire', 'town': 'March'},
    {'county': 'Kent', 'town': 'Margate'},
    {'county': 'Shropshire', 'town': 'Market Drayton'},
    {'county': 'Leicestershire', 'town': 'Market Harborough'},
    {'county': 'Lincolnshire', 'town': 'Market Rasen'},
    {'county': 'East Riding of Yorkshire', 'town': 'Market Weighton'},
    {'county': 'Wiltshire', 'town': 'Marlborough'},
    {'county': 'Buckinghamshire', 'town': 'Marlow'},
    {'county': 'Lincolnshire', 'town': 'Martin'},
    {'county': 'Cumbria', 'town': 'Maryport'},
    {'county': 'Derbyshire', 'town': 'Matlock'},
    {'county': 'Aberdeenshire', 'town': 'Maud'},
    {'county': 'Kent', 'town': 'Medway'},
    {'county': 'Powys', 'town': 'Meifod'},
    {'county': 'Wiltshire', 'town': 'Melksham'},
    {'county': 'Leicestershire', 'town': 'Melton Mowbray'},
    {'county': 'Wiltshire', 'town': 'Mere'},
    {'county': 'West Midlands', 'town': 'Meriden'},
    {'county': 'Mid Glamorgan', 'town': 'Merthyr Tydfil'},
    {'county': 'South Yorkshire', 'town': 'Mexborough'},
    {'county': 'Cleveland', 'town': 'Middlesbrough'},
    {'county': 'Cheshire', 'town': 'Middlewich'},
    {'county': 'West Sussex', 'town': 'Midhurst'},
    {'county': 'Suffolk', 'town': 'Mildenhall'},
    {'county': 'Pembrokeshire', 'town': 'Milford Haven'},
    {'county': 'Buckinghamshire', 'town': 'Milton Keynes'},
    {'county': 'Somerset', 'town': 'Minehead'},
    {'county': 'West Yorkshire', 'town': 'Mirfield'},
    {'county': 'Surrey', 'town': 'Mitcham'},
    {'county': 'Gloucestershire', 'town': 'Mitcheldean'},
    {'county': 'Clwyd', 'town': 'Mold'},
    {'county': 'Gwent', 'town': 'Monmouth'},
    {'county': 'Powys', 'town': 'Montgomery'},
    {'county': 'Angus', 'town': 'Montrose'},
    {'county': 'Surrey', 'town': 'Morden'},
    {'county': 'Lancashire', 'town': 'Morecambe'},
    {'county': 'Devon', 'town': 'Moretonhampstead'},
    {'county': 'Northumberiand', 'town': 'Morpeth'},
    {'county': 'East Ayrshire', 'town': 'Moscow'},
    {'county': 'Lanarkshire', 'town': 'Motherwell'},
    {'county': 'Midlothian', 'town': 'Musselburgh'},
    {'county': 'Avon', 'town': 'Nailsea'},
    {'county': 'Inverness-shire', 'town': 'Nairn'},
    {'county': 'Cheshire', 'town': 'Nantwich'},
    {'county': 'Pembrokeshire', 'town': 'Narberth'},
    {'county': 'Neath Port Talbot', 'town': 'Neath'},
    {'county': 'Gwynedd', 'town': 'Nefyn'},
    {'county': 'Lancashire', 'town': 'Nelson'},
    {'county': 'Inverness-shire', 'town': 'Nethy Bridge'},
    {'county': 'Surrey', 'town': 'New Malden'},
    {'county': 'Derbyshire', 'town': 'New Mills'},
    {'county': 'Nottinghamshire', 'town': 'Newark'},
    {'county': 'Berkshire', 'town': 'Newbury'},
    {'county': 'Co Down', 'town': 'Newcastle'},
    {'county': 'Staffordshire', 'town': 'Newcastle'},
    {'county': 'Dyfed', 'town': 'Newcastle Emlyn'},
    {'county': 'Tyne & Wear', 'town': 'Newcastle upon Tyne'},
    {'county': 'Roxburghshire', 'town': 'Newcastleton'},
    {'county': 'Gloucestershire', 'town': 'Newent'},
    {'county': 'East Sussex', 'town': 'Newhaven'},
    {'county': 'Suffolk', 'town': 'Newmarket'},
    {'county': 'Gwent', 'town': 'Newport'},
    {'county': 'Isle of Wight', 'town': 'Newport'},
    {'county': 'Shropshire', 'town': 'Newport'},
    {'county': 'Buckinghamshire', 'town': 'Newport Pagnell'},
    {'county': 'Cornwall', 'town': 'Newquay'},
    {'county': 'Devon', 'town': 'Newton Abbot'},
    {'county': 'Powys', 'town': 'Newtown'},
    {'county': 'Merseyside', 'town': 'Newtown-le- Willows'},
    {'county': 'Co Antrim', 'town': 'Newtownabbey'},
    {'county': 'Co Down', 'town': 'Newtownards'},
    {'county': 'East Lothian', 'town': 'North Berwick'},
    {'county': 'Tyne & Wear', 'town': 'North Shields'},
    {'county': 'Norfolk', 'town': 'North Walsham'},
    {'county': 'North Yorkshire', 'town': 'Northallerton'},
    {'county': 'Northamptonshire', 'town': 'Northampton'},
    {'county': 'Cheshire', 'town': 'Northwich'},
    {'county': 'Middlesex', 'town': 'Northwood'},
    {'county': 'Norfolk', 'town': 'Norwich'},
    {'county': 'Nottinghamshire', 'town': 'Nottingham'},
    {'county': 'Nottinghamshire', 'town': 'Nottinghamshire'},
    {'county': 'Warwickshire', 'town': 'Nuneaton'},
    {'county': 'Leicestershire', 'town': 'Oakham'},
    {'county': 'Argyll', 'town': 'Oban'},
    {'county': 'Devon', 'town': 'Okehampton'},
    {'county': 'Lancashire', 'town': 'Oldham'},
    {'county': 'Co Tyrone', 'town': 'Omagh'},
    {'county': 'Essex', 'town': 'Ongar'},
    {'county': 'Lancashire', 'town': 'Ormskirk'},
    {'county': 'Kent', 'town': 'Orpington'},
    {'county': 'West Yorkshire', 'town': 'Ossett'},
    {'county': 'Shropshire', 'town': 'Oswestry'},
    {'county': 'West Yorkshire', 'town': 'Otley'},
    {'county': 'Oxfordshire', 'town': 'Oxford'},
    {'county': 'Surrey', 'town': 'Oxted'},
    {'county': 'Devon', 'town': 'Paignton'},
    {'county': 'Renfrewshire', 'town': 'Paisley'},
    {'county': 'Suffolk', 'town': 'Pakenham'},
    {'county': 'Cornwall', 'town': 'Par'},
    {'county': 'Dyfed', 'town': 'Pembroke'},
    {'county': 'South Glamorgan', 'town': 'Penarth'},
    {'county': 'Herefordshire', 'town': 'Pencombe'},
    {'county': 'Midlothian', 'town': 'Penicuik'},
    {'county': 'Gwynedd', 'town': 'Penmaenmawr'},
    {'county': 'Gwynedd', 'town': 'Penrhyndeudraeth'},
    {'county': 'Cumbria', 'town': 'Penrith'},
    {'county': 'Cornwall', 'town': 'Penryn'},
    {'county': 'Cornwall', 'town': 'Penzance'},
    {'county': 'Hereford & Worcester', 'town': 'Pershore'},
    {'county': 'Perthshire', 'town': 'Perth'},
    {'county': 'Cambridgeshire', 'town': 'Peterborough'},
    {'county': 'Aberdeenshire', 'town': 'Peterhead'},
    {'county': 'Hampshire', 'town': 'Petersfield'},
    {'county': 'West Sussex', 'town': 'Petworth'},
    {'county': 'East Sussex', 'town': 'Pevensey'},
    {'county': 'Wiltshire', 'town': 'Pewsey'},
    {'county': 'North Yorkshire', 'town': 'Pickering'},
    {'county': 'Middlesex', 'town': 'Pinner'},
    {'county': 'Perthshire', 'town': 'Pitlochry'},
    {'county': 'Devon', 'town': 'Plymouth'},
    {'county': 'East Riding of Yorkshire', 'town': 'Pocklington'},
    {'county': 'West Yorkshire', 'town': 'Pontefract'},
    {'county': 'Mid Glamorgan', 'town': 'Pontyclun'},
    {'county': 'Torfaen', 'town': 'Pontypool'},
    {'county': 'Mid Glamorgan', 'town': 'Pontypridd'},
    {'county': 'Dorset', 'town': 'Poole'},
    {'county': 'Cumbria', 'town': 'Pooley Bridge'},
    {'county': 'Cornwall', 'town': 'Port Isaac'},
    {'county': 'West Glamorgan', 'town': 'Port Talbot'},
    {'county': 'Mid Glamorgan', 'town': 'Porthcawl'},
    {'county': 'Gwynedd', 'town': 'Porthmadog'},
    {'county': 'Isle of Skye', 'town': 'Portree'},
    {'county': 'Co Antrim', 'town': 'Portrush'},
    {'county': 'Hampshire', 'town': 'Portsmouth'},
    {'county': 'Hertfordshire', 'town': 'Potters Bar'},
    {'county': 'Lancashire', 'town': 'Poulton-le-Fylde'},
    {'county': 'Merseyside', 'town': 'Prescot'},
    {'county': 'Clwyd', 'town': 'Prestatyn'},
    {'county': 'Lancashire', 'town': 'Preston'},
    {'county': 'Ayrshire', 'town': 'Prestwick'},
    {'county': 'Buckinghamshire', 'town': 'Princes Risborough'},
    {'county': 'Northumberland', 'town': 'Prudhoe'},
    {'county': 'West Sussex', 'town': 'Pulborough'},
    {'county': 'Surrey', 'town': 'Purley'},
    {'county': 'Gwynedd', 'town': 'Pwllheli'},
    {'county': 'Hertfordshire', 'town': 'Radlett'},
    {'county': 'Isle of Man', 'town': 'Ramsey'},
    {'county': 'Kent', 'town': 'Ramsgate'},
    {'county': 'Cumbria', 'town': 'Raughton Head'},
    {'county': 'Essex', 'town': 'Rayleigh'},
    {'county': 'Berkshire', 'town': 'Reading'},
    {'county': 'Cleveland', 'town': 'Redcar'},
    {'county': 'Hereford and', 'town': 'Redditch'},
    {'county': 'Surrey', 'town': 'Redhill'},
    {'county': 'Cornwall', 'town': 'Redruth'},
    {'county': 'Surrey', 'town': 'Reigate'},
    {'county': 'Nottmghamshire', 'town': 'Retford'},
    {'county': 'Clwyd', 'town': 'Rhyl'},
    {'county': 'North Yorkshire', 'town': 'Richmond'},
    {'county': 'Surrey', 'town': 'Richmond'},
    {'county': 'Hertfordshire', 'town': 'Rickmansworth'},
    {'county': 'Northumberland', 'town': 'Riding Mill'},
    {'county': 'Hampshire', 'town': 'Ringwood'},
    {'county': 'Derbyshire', 'town': 'Ripley'},
    {'county': 'North Yorkshire', 'town': 'Ripon'},
    {'county': 'East Sussex', 'town': 'Robertsbridge'},
    {'county': 'Lancashire', 'town': 'Rochdale'},
    {'county': 'Kent', 'town': 'Rochester'},
    {'county': 'Essex', 'town': 'Rochford'},
    {'county': 'Hampshire', 'town': 'Rockbourne'},
    {'county': 'Essex', 'town': 'Romford'},
    {'county': 'Hampshire', 'town': 'Romsey'},
    {'county': 'Herefordshire', 'town': 'Ross-on-Wye'},
    {'county': 'Lancashire', 'town': 'Rossendale'},
    {'county': 'Northumberland', 'town': 'Rothbury'},
    {'county': 'South Yorkshire', 'town': 'Rotherham'},
    {'county': 'Isle ofBute', 'town': 'Rothesay'},
    {'county': 'Hertfordshire', 'town': 'Royston'},
    {'county': 'Warwickshire', 'town': 'Rugby'},
    {'county': 'Staffordshire', 'town': 'Rugeley'},
    {'county': 'Middlesex', 'town': 'Ruislip'},
    {'county': 'Cheshire', 'town': 'Runcorn'},
    {'county': 'Northamptonshire', 'town': 'Rushden'},
    {'county': 'Clwyd', 'town': 'Ruthin'},
    {'county': 'East Sussex', 'town': 'Rye'},
    {'county': 'Tyne & Wear', 'town': 'Ryton'},
    {'county': 'Essex', 'town': 'Saffron Walden'},
    {'county': 'Lancashire', 'town': 'Salford'},
    {'county': 'Wiltshire', 'town': 'Salisbury'},
    {'county': 'Cornwall', 'town': 'Saltash'},
    {'county': 'Cleveland', 'town': 'Saltburn-by-the-Sea'},
    {'county': 'Ayrshire', 'town': 'Saltcoats'},
    {'county': 'Cheshire', 'town': 'Sandbach'},
    {'county': 'Berkshire', 'town': 'Sandhurst'},
    {'county': 'Isle of Wight', 'town': 'Sandown'},
    {'county': 'Kent', 'town': 'Sandwich'},
    {'county': 'Bedfordshire', 'town': 'Sandy'},
    {'county': 'Dumfriesshire', 'town': 'Sanquhar'},
    {'county': 'Hertfordshire', 'town': 'Sawbridgeworth'},
    {'county': 'Suffolk', 'town': 'Saxmundham'},
    {'county': 'North Yorkshire', 'town': 'Scarborough'},
    {'county': 'Isle of Tiree', 'town': 'Scarinish'},
    {'county': 'South Humberside', 'town': 'Scunthorpe'},
    {'county': 'East Sussex', 'town': 'Seaford'},
    {'county': 'Co Durham', 'town': 'Seaham'},
    {'county': 'Northumberland', 'town': 'Seahouses'},
    {'county': 'Devon', 'town': 'Seaton'},
    {'county': 'Cumbria', 'town': 'Sedbergh'},
    {'county': 'Co Durham', 'town': 'Sedgefield'},
    {'county': 'North Yorkshire', 'town': 'Selby'},
    {'county': 'Selkirkshire', 'town': 'Selkirk'},
    {'county': 'North Yorkshire', 'town': 'Settle'},
    {'county': 'Kent', 'town': 'Sevenoaks'},
    {'county': 'Wiltshire', 'town': 'Shaftesbury'},
    {'county': 'Cumbria', 'town': 'Shap'},
    {'county': 'Isle of Lewis', 'town': 'Shawbost'},
    {'county': 'South Yorkshire', 'town': 'Sheffield'},
    {'county': 'Middlesex', 'town': 'Shepperton'},
    {'county': 'Somerset', 'town': 'Shepton Mallet'},
    {'county': 'Dorset', 'town': 'Sherborne'},
    {'county': 'Norfolk', 'town': 'Sheringham'},
    {'county': 'Isle of Shetland', 'town': 'Shetland'},
    {'county': 'Shropshire', 'town': 'Shifnal'},
    {'county': 'West Yorkshire', 'town': 'Shipley'},
    {'county': 'Shropshire', 'town': 'Shrewsbury'},
    {'county': 'Kent', 'town': 'Sidcup'},
    {'county': 'Devon', 'town': 'Sidmouth'},
    {'county': 'Kent', 'town': 'Sittingbourne'},
    {'county': 'Lincolnshire', 'town': 'Skegness'},
    {'county': 'Lancashire', 'town': 'Skelmersdale'},
    {'county': 'North Yorkshire', 'town': 'Skipton'},
    {'county': 'Lincolnshire', 'town': 'Sleaford'},
    {'county': 'Berkshire', 'town': 'Slough'},
    {'county': 'West Midlands', 'town': 'Solihull'},
    {'county': 'Surrey', 'town': 'South Croydon'},
    {'county': 'West Lothian', 'town': 'South Queensferry'},
    {'county': 'Devon', 'town': 'South Molton'},
    {'county': 'Somerset', 'town': 'South Petherton'},
    {'county': 'Merseyside', 'town': 'South Wirral'},
    {'county': 'Middlesex', 'town': 'Southall'},
    {'county': 'Warwickshire', 'town': 'Southam'},
    {'county': 'Hampshire', 'town': 'Southampton'},
    {'county': 'Essex', 'town': 'Southend-on-Sea'},
    {'county': 'Essex', 'town': 'Southminster'},
    {'county': 'Merseyside', 'town': 'Southport'},
    {'county': 'Hampshire', 'town': 'Southsea'},
    {'county': 'Nottinghamshire', 'town': 'Southwell'},
    {'county': 'North Yorkshire', 'town': 'Sowerby'},
    {'county': 'Lincolnshire', 'town': 'Spalding'},
    {'county': 'Lincolnshire', 'town': 'Spilsby'},
    {'county': 'Hertfordshire', 'town': 'St Albans'},
    {'county': 'Fife', 'town': 'St Andrews'},
    {'county': 'Clwyd', 'town': 'St Asaph'},
    {'county': 'Cornwall', 'town': 'St Austell'},
    {'county': 'Carmarthenshire', 'town': 'St Clears'},
    {'county': 'Merseyside', 'town': 'St Helens'},
    {'county': 'Cornwall', 'town': 'St Ives'},
    {'county': 'East Sussex', 'town': 'St Leonards-on-Sea'},
    {'county': 'Staffordshire', 'town': 'Stafford'},
    {'county': 'Middlesex', 'town': 'Staines'},
    {'county': 'Lincolnshire', 'town': 'Stamford'},
    {'county': 'Essex', 'town': 'Stanford-le-Hope'},
    {'county': 'Middlesex', 'town': 'Stanmore'},
    {'county': 'Hertfordshire', 'town': 'Stevenage'},
    {'county': 'Stirlingshire', 'town': 'Stirling'},
    {'county': 'Cheshire', 'town': 'Stockport'},
    {'county': 'Northumberland', 'town': 'Stocksfield'},
    {'county': 'Cleveland', 'town': 'Stockton-on-Tees'},
    {'county': 'Staffordshire', 'town': 'Stoke-on-Trent'},
    {'county': 'Staffordshire', 'town': 'Stone'},
    {'county': 'Kincardineshire', 'town': 'Stonehaven'},
    {'county': 'Isle of Lewis', 'town': 'Stornoway'},
    {'county': 'West Midlands', 'town': 'Stourbridge'},
    {'county': 'Hereford & Worcester', 'town': 'Stourport-on-Severn'},
    {'county': 'Gloucestershire', 'town': 'Stow-on-the-Wold'},
    {'county': 'Suffolk', 'town': 'Stowmarket'},
    {'county': 'Wigtownshire', 'town': 'Stranraer'},
    {'county': 'Warwickshire', 'town': 'Stratford-upon-Avon'},
    {'county': 'Ross-shire', 'town': 'Strathcarron'},
    {'county': 'South Lanarkshire', 'town': 'Strathaven'},
    {'county': 'Ross-shire', 'town': 'Strathpeffer'},
    {'county': 'Somerset', 'town': 'Street'},
    {'county': 'Gloucestershire', 'town': 'Stroud'},
    {'county': 'Suffolk', 'town': 'Sudbury'},
    {'county': 'Middlesex', 'town': 'Sunbury-on-Thames'},
    {'county': 'Tyne & Wear', 'town': 'Sunderland'},
    {'county': 'Surrey', 'town': 'Surbiton'},
    {'county': 'Surrey', 'town': 'Sutton'},
    {'county': 'West Midlands', 'town': 'Sutton Coldfield'},
    {'county': 'Nottinghamshire', 'town': 'Sutton-in-Ashfield'},
    {'county': 'Norfolk', 'town': 'Swaffham'},
    {'county': 'Dorset', 'town': 'Swanage'},
    {'county': 'Kent', 'town': 'Swanley'},
    {'county': 'West Glamorgan', 'town': 'Swansea'},
    {'county': 'Wiltshire', 'town': 'Swindon'},
    {'county': 'Ross-shire', 'town': 'Tain'},
    {'county': 'Gwynedd', 'town': 'Talybont'},
    {'county': 'Staffordshire', 'town': 'Tamworth'},
    {'county': 'Argyll', 'town': 'Tarbert'},
    {'county': 'Cheshire', 'town': 'Tarporley'},
    {'county': 'Somerset', 'town': 'Taunton'},
    {'county': 'Devon', 'town': 'Tavistock'},
    {'county': 'Middlesex', 'town': 'Teddington'},
    {'county': 'Devon', 'town': 'Teignmouth'},
    {'county': 'Shropshire', 'town': 'Telford'},
    {'county': 'Somerset', 'town': 'Temple Cloud'},
    {'county': 'Somerset', 'town': 'Templecombe'},
    {'county': 'Dyfed', 'town': 'Tenby'},
    {'county': 'Gloucestershire', 'town': 'Tewkesbury'},
    {'county': 'Oxfordshire', 'town': 'Thame'},
    {'county': 'Kent', 'town': 'Thanet'},
    {'county': 'Berkshire', 'town': 'Thatcham'},
    {'county': 'Norfolk', 'town': 'Thetford'},
    {'county': 'North Yorkshire', 'town': 'Thirsk'},
    {'county': 'Surrey', 'town': 'Thornton Heath'},
    {'county': 'Caithness', 'town': 'Thurso'},
    {'county': 'Essex', 'town': 'Tilbury'},
    {'county': 'West Midlands', 'town': 'Tipton'},
    {'county': 'Devon', 'town': 'Tiverton'},
    {'county': 'West Yorkshire', 'town': 'Todmorden'},
    {'county': 'Kent', 'town': 'Tonbridge'},
    {'county': 'Devon', 'town': 'Torquay'},
    {'county': 'Devon', 'town': 'Torrington'},
    {'county': 'Isle of Wight', 'town': 'Totland Bay'},
    {'county': 'Northamptonshire', 'town': 'Towcester'},
    {'county': 'East Lothian', 'town': 'Tranent'},
    {'county': 'Gwent', 'town': 'Tredegar'},
    {'county': 'Hertfordshire', 'town': 'Tring'},
    {'county': 'Wiltshire', 'town': 'Trowbridge'},
    {'county': 'Cornwall', 'town': 'Truro'},
    {'county': 'Kent', 'town': 'Tunbridge Wells'},
    {'county': 'Aberdeenshire', 'town': 'Turriff'},
    {'county': 'Middlesex', 'town': 'Twickenham'},
    {'county': 'Gwynedd', 'town': 'Tywyn'},
    {'county': 'East Sussex', 'town': 'Uckfield'},
    {'county': 'Cumbria', 'town': 'Ulverston'},
    {'county': 'Devon', 'town': 'Umberleigh'},
    {'county': 'Staffordshire', 'town': 'Uttoxeter'},
    {'county': 'Middlesex', 'town': 'Uxbridge'},
    {'county': 'Isle ofWight', 'town': 'Ventnor'},
    {'county': 'Cornwall', 'town': 'Wadebridge'},
    {'county': 'West Yorkshire', 'town': 'Wakefield'},
    {'county': 'Merseyside', 'town': 'Wallasey'},
    {'county': 'Oxfordshire', 'town': 'Wallingford'},
    {'county': 'Surrey', 'town': 'Wallington'},
    {'county': 'West Midlands', 'town': 'Walsall'},
    {'county': 'Norfolk', 'town': 'Walsingham'},
    {'county': 'Hertfordshire', 'town': 'Waltham Cross'},
    {'county': 'Essex', 'town': 'Walton on the Naze'},
    {'county': 'Surrey', 'town': 'Walton-on-Thames'},
    {'county': 'Oxfordshire', 'town': 'Wantage'},
    {'county': 'Cambridgeshire', 'town': 'Warboys'},
    {'county': 'Hertfordshire', 'town': 'Ware'},
    {'county': 'Dorset', 'town': 'Wareham'},
    {'county': 'West Midlands', 'town': 'Warley'},
    {'county': 'Wiltshire', 'town': 'Warminster'},
    {'county': 'Cheshire', 'town': 'Warrington'},
    {'county': 'Warwickshire', 'town': 'Warwick'},
    {'county': 'Warwickshire', 'town': 'Warwickshire'},
    {'county': 'Tyne & Wear', 'town': 'Washington'},
    {'county': 'Somerset', 'town': 'Watchet'},
    {'county': 'Hertfordshire', 'town': 'Watford'},
    {'county': 'Somerset', 'town': 'Wedmore'},
    {'county': 'Kent', 'town': 'Welling'},
    {'county': 'Northamptonshire', 'town': 'Wellingborough'},
    {'county': 'Somerset', 'town': 'Wells'},
    {'county': 'Norfolk', 'town': 'Wells-next-the-Sea'},
    {'county': 'Powys', 'town': 'Welshpool'},
    {'county': 'Hertfordshire', 'town': 'Welwyn'},
    {'county': 'Hertfordshire', 'town': 'Welwyn Garden City'},
    {'county': 'Shropshire', 'town': 'Wem'},
    {'county': 'Middlesex', 'town': 'Wembley'},
    {'county': 'West Midlands', 'town': 'West Bromwich'},
    {'county': 'Surrey', 'town': 'West Byfleet'},
    {'county': 'Middlesex', 'town': 'West Drayton'},
    {'county': 'North Yorkshire', 'town': 'West Heslerton'},
    {'county': 'Ayrshire', 'town': 'West Kilbride'},
    {'county': 'Peeblesshire', 'town': 'West Linton'},
    {'county': 'Kent', 'town': 'West Malling'},
    {'county': 'Kent', 'town': 'West Wickham'},
    {'county': 'Wiltshire', 'town': 'Westbury'},
    {'county': 'Essex', 'town': 'Westcliff-on-Sea'},
    {'county': 'Kent', 'town': 'Westerham'},
    {'county': 'Avon', 'town': 'Weston-super-Mare'},
    {'county': 'West Yorkshire', 'town': 'Wetherby'},
    {'county': 'Surrey', 'town': 'Weybridge'},
    {'county': 'Dorset', 'town': 'Weymouth'},
    {'county': 'Nottinghamshire', 'town': 'Whatton'},
    {'county': 'North Yorkshire', 'town': 'Whitby'},
    {'county': 'Hampshire', 'town': 'Whitchurch'},
    {'county': 'Shropshire', 'town': 'Whitchurch'},
    {'county': 'Cumbria', 'town': 'Whitehaven'},
    {'county': 'Dyfed', 'town': 'Whitland'},
    {'county': 'Tyne & Wear', 'town': 'Whitley Bay'},
    {'county': 'Kent', 'town': 'Whitstable'},
    {'county': 'Caithness', 'town': 'Wick'},
    {'county': 'Essex', 'town': 'Wickford'},
    {'county': 'Lancashire', 'town': 'Wigan'},
    {'county': 'Cumbria', 'town': 'Wigton'},
    {'county': 'Cheshire', 'town': 'Wilmslow'},
    {'county': 'Dorset', 'town': 'Wimborne'},
    {'county': 'Somerset', 'town': 'Wincanton'},
    {'county': 'Hampshire', 'town': 'Winchester'},
    {'county': 'Cumbria', 'town': 'Windermere'},
    {'county': 'Berkshire', 'town': 'Windsor'},
    {'county': 'Somerset', 'town': 'Winscombe'},
    {'county': 'Merseyside', 'town': 'Wirral'},
    {'county': 'Cambridgeshire', 'town': 'Wisbech'},
    {'county': 'Lanarkshire', 'town': 'Wishaw'},
    {'county': 'Buckinghamshire', 'town': 'Witham'},
    {'county': 'Essex', 'town': 'Witham'},
    {'county': 'Oxfordshire', 'town': 'Witney'},
    {'county': 'Surrey', 'town': 'Woking'},
    {'county': 'Berkshire', 'town': 'Wokingham'},
    {'county': 'West Midlands', 'town': 'Wolverhampton'},
    {'county': 'Essex', 'town': 'Woodford Green'},
    {'county': 'Hereford & Worcester', 'town': 'Worcester'},
    {'county': 'Cumbria', 'town': 'Workington'},
    {'county': 'Nottinghamshire', 'town': 'Worksop'},
    {'county': 'Herefordshire', 'town': 'Wormbridge'},
    {'county': 'West Sussex', 'town': 'Worthing'},
    {'county': 'Gloucestershire', 'town': 'Wotton-under-Edge'},
    {'county': 'Clwyd', 'town': 'Wrexham'},
    {'county': 'Norfolk', 'town': 'Wymondham'},
    {'county': null, 'town': 'Yateley'},
    {'county': 'Devon', 'town': 'Yelverton'},
    {'county': NaN, 'town': 'Yeovil'},
    {'county': 'North Yorkshire', 'town': 'York'}
];

function pluck(collection, key, skipNone=false) {
    let i = 0;
    let length = collection.length;
    const plucked = Array(length);

    if (skipNone) {
        let j = 0;
        while (j < length) {
            const value = collection[j][key];
            
            if (Number.isNaN(value) || value == undefined) {
                j++;
                continue;
            }
            
            plucked[i] = value;
            i++;
            j++;
        }
        plucked.length = i;
        return plucked;
    }

    while (i < length) {
        plucked[i] = collection[i][key];
        i++;
    }

    return plucked;
}

Tests:

my pluck function with skipNone
pluck(locations, 'county', true)
native JS map and filter
locations.map(({county}) => county).filter((county) => (Number.isNaN(county) || county == undefined) ? false : true)
lodash _.map and iteratee
_.filter(_.map(locations, 'county'), (county) => (Number.isNaN(county) || county == undefined) ? false : true)
my pluck function without skipNone
pluck(locations, 'county')
native JS map
locations.map(({county}) => county)
lodash _.map
_.map(locations, 'county')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
my pluck function with skipNone
native JS map and filter
lodash _.map and iteratee
my pluck function without skipNone
native JS map
lodash _.map

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 5 days ago):

LLMs can make mistakes. Check important info.

The benchmark being tested compares three different approaches for extracting specific properties from an array of objects—specifically, the `county` property from location objects. The methods under examination are:

1. **A custom `pluck` function** (written from scratch).
2. **Native JavaScript methods** (using `Array.prototype.map()`).
3. **Lodash library methods** (using Lodash's `_.map` and `_.filter`).

### Options Being Compared

1. **Custom `pluck` Function**:
   - **With Skip Option (`skipNone = true`)**: It collects values associated with the specified key while skipping any undefined or NaN values.
   - **Without Skip Option**: It collects values directly without filtering out undefined or NaN values.
   
2. **Native JavaScript with `map` & `filter`**:
   - Using `map` to retrieve values and then `filter` to remove any that are undefined or NaN.

3. **Lodash Library Functions**:
   - Using `_.map` to collect values and `_.filter` to exclude undefined or NaN entries.

### Execution Results

The benchmark results show the number of executions per second for each method across different scenarios:

- The custom `pluck` function performed best with the skip option enabled, achieving **336,109** executions per second.
- The Lodash `_.map` function followed with **192,012** executions per second.
- The native `map` performed slightly slower than Lodash, at **172,820** executions per second.
- The custom `pluck` function without skipping performed at **159,370** executions per second.
- The combination of native `map` and `filter` yielded **2,784** executions per second, indicating performance issues.
- The Lodash combined method of `_.map` and `_.filter` performed poorly with **3,206** executions per second.

### Pros and Cons of Different Approaches

1. **Custom `pluck` Function**:
   - **Pros**:
     - Highly efficient for its specific task, especially with `skipNone` filter.
     - Can be optimized specifically for the data structure and access pattern.
   - **Cons**:
     - Less flexible than native or library functions—it may require modifications for different data handling strategies.

2. **Native JavaScript** (`map` and `filter`):
   - **Pros**:
     - Part of the ECMAScript standard; no additional libraries are required.
     - More readable and idiomatic for JavaScript developers.
   - **Cons**:
     - Less performant than the custom function, especially when using combinations like `map` and `filter` which process the array multiple times.

3. **Lodash Functions**:
   - **Pros**:
     - Provides robust utility functions that help with common tasks, improving code readability.
     - Handles a wide variety of data structures and types with built-in functions.
   - **Cons**:
     - Introduces dependency on an external library, which might increase the package size.
     - Slower performance compared to optimized custom methods in simple scenarios.

### Alternatives

Other potential alternatives include:

- **Using `reduce`**: A single-pass solution that accumulates the results into an array can also be considered but might complicate the code's readability.
  
- **Typed Arrays or Immutable.js**: For specific use cases where performance is critical and data is structured appropriately, using typed arrays or libraries designed for immutability might provide better performance.

- **Manual iterations (e.g., `for` loops)**: For complete control over the iteration and performance, especially if the data structure size is known and limited.

### Conclusion

Choosing the right method depends heavily on the specific use case, readability requirements, and performance needs. For scenarios focused purely on extracting values with an emphasis on speed, the custom `pluck` function, particularly with filtering, appears optimal. Native JavaScript is easier for maintenance and understanding, while Lodash offers rich utilities suited for diverse requirements, though potentially at the expense of performance.

Latest run results:

Run details: (Test run date: 5 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Windows

View result in a separate tab

Test name	Executions per second
my pluck function with skipNone	159370.6 Ops/sec
native JS map and filter	2784.4 Ops/sec
lodash _.map and iteratee	3206.2 Ops/sec
my pluck function without skipNone	336109.6 Ops/sec
native JS map	172820.9 Ops/sec
lodash _.map	192012.2 Ops/sec

Related benchmarks:

Custom pluck test vs JS map vs lodash map (version: 3)

Comparing performance of: my pluck function with skipNone vs native JS map and filter vs lodash _.map and iteratee vs my pluck function without skipNone vs native JS map vs lodash _.map

Created: 5 days ago by: Registered User

Jump to the latest result

my pluck function with skipNone

native JS map and filter

lodash _.map and iteratee

my pluck function without skipNone

native JS map

lodash _.map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 5 days ago):