Run results for: _.isEqual vs For-loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Native arraysEqual — reversed array

191.0M/s

Native arraysEqual — shuffled array

185.7M/s

Lodash _.isEqual — reversed array

20.2M/s

Lodash _.isEqual — shuffled array

8.5M/s

Native arraysEqual with one value different

3.6M/s

Lodash _.isEqual with one value different

193K/s

Native arraysEqual with same array

27K/s

Lodash _.isEqual with same array

8K/s

View exact numbers

Test name	Executions per second
✓ Native arraysEqual — reversed array	191,018,624 Ops/sec
Native arraysEqual — shuffled array	185,721,744 Ops/sec
Lodash _.isEqual — reversed array	20,243,362 Ops/sec
Lodash _.isEqual — shuffled array	8,465,311 Ops/sec
Native arraysEqual with one value different	3,625,920 Ops/sec
Lodash _.isEqual with one value different	193,025 Ops/sec
Native arraysEqual with same array	27,428 Ops/sec
Lodash _.isEqual with same array	7,502 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

// Polyfill for older environments (no let/const or destructuring)
function arraysEqual(a, b) {
  if (a.length !== b.length) return false;
  for (var i = 0; i < a.length; i++) {
    if (a[i] !== b[i]) return false;
  }
  return true;
}

// Create a variety of test arrays
var size = 100000;
var base = [];
for (var i = 0; i < size; i++) {
  base.push(i);
}

var same = base.slice(); // Identical
var reversed = base.slice().reverse(); // Same content, reversed

// Shuffle manually without destructuring
var shuffled = base.slice();
for (var i = shuffled.length - 1; i > 0; i--) {
  var j = Math.floor(Math.random() * (i + 1));
  var temp = shuffled[i];
  shuffled[i] = shuffled[j];
  shuffled[j] = temp;
}

var oneDiff = base.slice();
oneDiff[500] = -1; // One value changed

var completelyDifferent = [];
for (var i = 0; i < size; i++) {
  completelyDifferent.push(i + 1000000);
}

Tests:

Native arraysEqual with same array
arraysEqual(base, same);
Lodash _.isEqual with same array
_.isEqual(base, same);
Native arraysEqual with one value different
arraysEqual(base, oneDiff);
Lodash _.isEqual with one value different
_.isEqual(base, oneDiff);
Native arraysEqual — reversed array
arraysEqual(base, reversed);
Lodash _.isEqual — reversed array
_.isEqual(base, reversed);
Native arraysEqual — shuffled array
arraysEqual(base, shuffled);
Lodash _.isEqual — shuffled array
_.isEqual(base, shuffled);