Benchmark: merge object by key from array with lodash

HTML Preparation code:

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

Script Preparation code:

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'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.reduce()
_.reduce()
_.reduce() with _.get()
_.keyBy()

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36

Browser/OS: Chrome 64 on Mac OS X 10.13.3

View result in a separate tab

Test name	Executions per second
Array.prototype.reduce()	1169103.0 Ops/sec
_.reduce()	852002.4 Ops/sec
_.reduce() with _.get()	368060.1 Ops/sec
_.keyBy()	448038.9 Ops/sec

merge object by key from array with lodash (version: 0)

Comparing performance of: Array.prototype.reduce() vs _.reduce() vs _.reduce() with _.get() vs _.keyBy()

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.reduce()

_.reduce()

_.reduce() with _.get()

_.keyBy()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A