Benchmark: flatMap vs reduce complicated, for loop

Script Preparation code:

var arr = Array(1000).fill({data: Array(20).fill({
        id: 21353,
        client_id: 29187,
        chain_id: 3,
        restaurant_id: 18,
        table_id: null,
        status: 'confirmed',
        total: 40.5,
        tax: 4.5,
        tips: null,
        created_at: '2023-06-14T10:58:17.000000Z',
        pay_amount: 40.5,
        table_code: '12',
        is_takeaway: false,
        takeaway_at: null,
        comment: null,
        tip_percent: null,
        cutlery_count: null,
        tax_percent: null,
        type: 'dinein',
        service_charge_percent: '12.5',
        service_charge: 4.5,
        subtotal: 31.5,
        order_items_tags: '["drink", "food"]',
        roid: 12289,
        payment_id: null,
        uuid: '2e5b8fd4-82c2-4d54-ac1b-e29ad3ef894a',
        pending_at: '2023-06-14 10:58:21+00',
        confirmed_at: '2023-06-14 10:59:49+00',
        ready_at: null,
        completed_at: null,
        canceled_at: null,
        last_items_completed_at: '2023-06-14 11:15:05+00',
        client_address_id: null,
        is_paid: true,
        is_external: false,
        order_configuration: '{}',
        refund_amount: 0,
        refund_status: 'no_refunded',
        discount: '0',
        created: '14 Jun 2023 at 11:58',
        pickupAt: '2023-10-07T09:19:03.774+01:00',
        table_session_id: 4928,
        items: [
            {
                id: 48738,
                dish_id: 16222,
                dish_configuration: {
                    items: [
                        {
                            id: 323,
                            name: 'Oat Milk'
                        },
                        {
                            id: 375,
                            name: 'Ice'
                        }
                    ]
                },
                name: 'Flat White',
                amount: 2,
                price: 4,
                total: 9,
                status: 'pending',
                created_at: '2023-06-14T10:58:17.000000Z',
                updated_at: '2023-06-14T10:58:17.000000Z',
                order_id: 21353,
                position: null,
                pending_at: '2023-06-14 10:58:17+00',
                cooking_at: null,
                ready_at: null,
                completed_at: null,
                canceled_at: null,
                is_paid: false,
                modifiers: [
                    {
                        id: 323,
                        category_id: 71,
                        name: 'Oat Milk',
                        price: 0.5,
                        min_amount: null,
                        max_amount: null,
                        position: 1,
                        created_at: '2021-04-29T14:25:00.000000Z',
                        updated_at: '2022-07-08T17:22:39.000000Z',
                        archived_at: null
                    },
                    {
                        id: 375,
                        category_id: 89,
                        name: 'Ice',
                        price: 0,
                        min_amount: null,
                        max_amount: null,
                        position: 0,
                        created_at: '2021-05-29T14:01:54.000000Z',
                        updated_at: '2022-05-01T10:29:41.000000Z',
                        archived_at: null
                    }
                ]
            },
            {
                id: 48739,
                dish_id: 16189,
                dish_configuration: {
                    items: []
                },
                name: 'Matcha Pancakes Sweet',
                amount: 2,
                price: 13.5,
                total: 27,
                status: 'completed',
                created_at: '2023-06-14T10:58:17.000000Z',
                updated_at: '2023-06-14T11:15:05.000000Z',
                order_id: 21353,
                position: null,
                pending_at: '2023-06-14 10:58:17+00',
                cooking_at: null,
                ready_at: '2023-06-14 11:15:04+00',
                completed_at: '2023-06-14 11:15:05+00',
                canceled_at: null,
                is_paid: false,
                modifiers: []
            }
        ],
        payment_status: 'paid',
        payment_type: 'cheqit',
        left_to_pay: 0,
        restaurant: {
            id: 18,
            name: 'All Day Menu',
            photo: null,
            point: {
                type: 'Point',
                coordinates: [-0.12411, 51.510926]
            },
            address: '24 Henrietta Street, London, UK',
            comment: null,
            description: null,
            rating: null,
            price: null,
            welcome_header: null,
            welcome_text: null,
            promo_header: null,
            chain_id: 3,
            pos_type: null,
            taxation: null,
            choose_table_by_code: false,
            has_delivery: true,
            has_takeaway: true,
            has_dine_in: true,
            phone: null,
            opens_at: '7:00 AM',
            closes_at: '9:00 PM',
            time_zone_name: 'Europe/London',
            service_charge_percent: '12.5',
            default_integration_id: 11,
            service_charge_round: null,
            tips_allowed: true,
            order_notes_allowed: true,
            cutlery_allowed: false,
            pat_ordering_enabled: true,
            pat_menu_enabled: true,
            is_open: true,
            times: [
                {
                    id: 20,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'saturday',
                    from: '07:00:00',
                    to: '21:00:00'
                },
                {
                    id: 18,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'thursday',
                    from: '09:00:00',
                    to: '16:00:00'
                },
                {
                    id: 21,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'sunday',
                    from: '09:00:00',
                    to: '19:00:00'
                },
                {
                    id: 16,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'tuesday',
                    from: '00:00:00',
                    to: '23:45:00'
                },
                {
                    id: 15,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'monday',
                    from: '00:00:00',
                    to: '23:45:00'
                },
                {
                    id: 19,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'friday',
                    from: '00:00:00',
                    to: '23:45:00'
                },
                {
                    id: 17,
                    restaurant_id: 18,
                    status: 'enabled',
                    day: 'wednesday',
                    from: '00:00:00',
                    to: '23:45:00'
                }
            ],
            integration: {
                id: 11,
                restaurant_id: 18,
                integration_id: 2,
                token: 'bf3bf188d1117299c125c8b6b8319ed273b992563eab5ed14b85bc4840d52281',
                params: {
                    server: 'https://api-ru.iiko.services/',
                    api_login: '3e14432b-0c1',
                    organization_id: '60dc121e-1ee7-48cd-b9c3-0a70a1a1784f',
                    terminal_group_id: 'ba61d9d6-f0fb-2628-0180-419a474f0064',
                    payment_id: '81175e04-87fd-43ec-81da-981dddaf6edf',
                    external_menu_id: '9052'
                },
                allowed_webhooks: null,
                integration: {
                    id: 2,
                    name: 'iiko_transport',
                    title: 'iikoTransport',
                    type: 'pos'
                }
            }
        },
        client: {
            id: 29187,
            email: '3db93239-5e75-40dd-9e48-9dec871e41a6@cheqit.app',
            name: 'Client #29187',
            photo: null,
            phone: null,
            chain_id: 3,
            birthdate: null,
            status: 'pending'
        },
        table: null
    })})

Tests:

reduce with concat
arr.reduce((acc, page) => [...acc, ...page.data], [])
flatMap
arr.flatMap((page) => page.data)
for loop
const newArr = []; for (let i = 0; i < arr.length; i++) { for (let j = 0; j < arr[i].data.length; j++) { newArr.push(arr[i].data[j]); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce with concat
flatMap
for loop

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/118.0

Browser/OS: Firefox 118 on Ubuntu

View result in a separate tab

Test name	Executions per second
reduce with concat	11.9 Ops/sec
flatMap	5217.5 Ops/sec
for loop	7655.6 Ops/sec

Related benchmarks:

flatMap vs reduce complicated, for loop (version: 7)

Comparing performance of: reduce with concat vs flatMap vs for loop

Created: one year ago by: Registered User

Jump to the latest result

reduce with concat

flatMap

for loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):