Run results for: sdffskdfklsdf

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36

Browser: Chrome 88

Operating system: Mac OS X 10.15.5

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
111111	637531.4 Ops/sec
2222	11739784.0 Ops/sec
33333	10775292.0 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.core.js"></script>

Script Preparation code:

var data = {
    'member_info_decrypt': [{
            'firebase_id': '1',
            'member_id': '1',
            'mobile_no': '1',
        },
        {
            'firebase_id': '2',
            'member_id': '2',
            'mobile_no': '2',
        },
        {
            'firebase_id': '3',
            'member_id': '3',
            'mobile_no': '3',
        }
    ]
};

Tests:

111111
_.map(data.member_info_decrypt, object => { return _.pick(object, ['firebase_id', 'member_id', 'mobile_no']) })
2222
const items = data.member_info_decrypt; items.map(({firebase_id,member_id,mobile_no})=>({firebase_id,member_id,mobile_no}))
33333
const items = data.member_info_decrypt; const length = items.length; const result = []; for(var i=0; i<length; i++) { const {firebase_id,member_id,mobile_no} = items[i]; result[i] = { firebase_id,member_id,mobile_no } }

Run results for: sdffskdfklsdf

Compare the new ES6 spread operator with the traditional concat() method

111111

2222

33333