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Run results for:
Array concat vs spread vs push spread, loop, apply
Compare the new ES6 spread operator with the traditional concat() method and push
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=573742" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Android 14; Mobile; rv:133.0) Gecko/133.0 Firefox/133.0
Browser:
Firefox Mobile 133
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
Push Loop
8.9M/s
Push Spread
5.0M/s
Push Apply
4.9M/s
Array.prototype.concat
4.9M/s
spread operator
2.2M/s
View exact numbers
Test name
Executions per second
✓
Push Loop
8,924,428 Ops/sec
Push Spread
4,962,452 Ops/sec
Push Apply
4,885,063 Ops/sec
Array.prototype.concat
4,864,270 Ops/sec
spread operator
2,220,664 Ops/sec
Script Preparation code:
var subarrs = [ [ "hello", true, 7 ], [ "yes", "no", "maybe", false, 27 ], [ 16, "I", "wonder", "what", "will", "be", "fastest"] ];
Tests:
Array.prototype.concat
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other = other.concat(subarrs[i]); } return other;
spread operator
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other = [ ...other, ...subarrs[i] ] } return other;
Push Spread
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other.push(...subarrs[i]); } return other;
Push Apply
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other.push.apply(other, subarrs[i]); } return other;
Push Loop
var other = [ 1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ for (var jarr = subarrs[i], jen = jarr.length, j = 0; j < jen; j++){ other.push(jarr[j]); } } return other;