Benchmark: Test on isEqual and fastEqual false performance

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

window.foo = { arr: [1, 3], num: 12, o: { name: 'foo' }, quantum: [{ spin: 'x' }, { spin: 'y' }]};
window.bar = { arr: [1, 2], num: 12, o: { name: 'foo' }, quantum: [{ spin: 'x' }, { spin: 'y' }]};

var isArray = Array.isArray;
var keyList = Object.keys;
var hasProp = Object.prototype.hasOwnProperty;

function fastEqual(a, b) {
  if (a === b) return true;

  if (a && b && typeof a == 'object' && typeof b == 'object') {
    var arrA = isArray(a)
      , arrB = isArray(b)
      , i
      , length
      , key;

    if (arrA && arrB) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;)
        if (!fastEqual(a[i], b[i])) return false;
      return true;
    }

    if (arrA != arrB) return false;

    var dateA = a instanceof Date
      , dateB = b instanceof Date;
    if (dateA != dateB) return false;
    if (dateA && dateB) return a.getTime() == b.getTime();

    var regexpA = a instanceof RegExp
      , regexpB = b instanceof RegExp;
    if (regexpA != regexpB) return false;
    if (regexpA && regexpB) return a.toString() == b.toString();

    var keys = keyList(a);
    length = keys.length;

    if (length !== keyList(b).length)
      return false;

    for (i = length; i-- !== 0;)
      if (!hasProp.call(b, keys[i])) return false;

    for (i = length; i-- !== 0;) {
      key = keys[i];
      if (!fastEqual(a[key], b[key])) return false;
    }

    return true;
  }

  return a!==a && b!==b;
};

window.fastEqual = fastEqual;

Tests:

_.isEqual
_.isEqual(window.foo, window.bar)
JSON.stringify
JSON.stringify(window.foo) === JSON.stringify(window.bar);
fastEqual
window.fastEqual(window.foo, window.bar);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual
JSON.stringify
fastEqual

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36

Browser/OS: Chrome 100 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.isEqual	1528323.0 Ops/sec
JSON.stringify	861981.3 Ops/sec
fastEqual	316524.2 Ops/sec

Test on isEqual and fastEqual false performance (version: 2)

Comparing performance of: _.isEqual vs JSON.stringify

Comparing performance of: _.isEqual vs JSON.stringify vs fastEqual

Created: 5 years ago by: Registered User

Jump to the latest result

_.isEqual

JSON.stringify

fastEqual

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A