Array.prototype.push.apply vs concat

JavaScript performance comparison

Revision 17 of this test case created by Hemant Singal

Preparation code 

<script>
  var x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
      y = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
  var arrPush = Array.prototype.push;
</script>

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Testing in ArchiveTeam ArchiveBot 20190617.01.0 / Windows 7 0.0.0
Test Ops/sec
concat 
var a = x.slice(0),
    b = y.slice(0);

a = a.concat(b);
 pending…
Array#push.apply 
var a = x.slice(0),
    b = y.slice(0);

Array.prototype.push.apply(a, b);
 pending…
Array#push with loop 
var a = x.slice(0),
    b = y.slice(0),
    i = 0,
    c = b.length;

for (; i < c; ++i) {
  a.push(b[i]);
}
 pending…
Cached Array#push 
var a = x.slice(0),
    b = y.slice(0);

arrPush.apply(a, b);
 pending…
Splice 
var a = x.slice(0),
    b = y.slice(0);
a.splice.apply(a, [b.length, 9e9].concat(b))
 pending…

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Revisions

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