Run results for: merge object by key from array with lodash

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.prototype.reduce()	580360.6 Ops/sec
_.reduce()	443271.6 Ops/sec
_.reduce() with _.get()	261139.8 Ops/sec
_.keyBy()	544202.6 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.5/lodash.min.js"></script>

Script Preparation code:

var key = 'key';

var object = {
  'a': {
    'key': 'a',
    'foo': 123123,
    'bar': 123,
    'fobar': 456
  }
};

var array = [
  {
    'key': 'b',
    'foo': 67563,
    'bar': 6345,
    'fobar': 3425
  },
  {
    'key': 'c',
    'foo': 34532,
    'bar': 123412,
    'fobar': 534532
  },
  {
    'key': 'd',
    'foo': 1234321,
    'bar': 435234,
    'fobar': 346457
  },
  {
    'key': 'e',
    'foo': 23523,
    'bar': 124325,
    'fobar': 2134235
  },
  {
    'key': 'f',
    'foo': 1235213,
    'bar': 346346,
    'fobar': 213423
  }
];

Tests:

Array.prototype.reduce()
array.reduce(function(acc, cur) { acc[cur[key]] = cur; return acc; }, Object.assign({}, object));
_.reduce()
_.reduce(array, function(acc, cur) { acc[cur[key]] = cur; return acc; }, Object.assign({}, object));
_.reduce() with _.get()
_.reduce(array, function(acc, cur) { acc[_.get(cur, key)] = cur; return acc; }, Object.assign({}, object));
_.keyBy()
Object.assign({}, object, _.keyBy(array, key));

Run results for: merge object by key from array with lodash

Array.prototype.reduce()

_.reduce()

_.reduce() with _.get()

_.keyBy()