Array.prototype.push.apply vs concat

Benchmark created by Eugene Scherba on

Description

This page tests speed of two different methods for array concatenation. Array method concat() has no side effects (it creates a new array to store its result in), while Array.prototype.push.apply(A, [1, 2, ...]) extends the array A.

Preparation HTML

<script>
  var len = 150;
  var x = new Array(len),
      y = new Array(len);
  for (var i = 0; i < len; i++) {
   x[i] = i;
   y[i] = -i;
  }
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
concat
var a = x.slice(0),
    b = y.slice(0);

a = a.concat(b);
ready
Array.prototype.push.apply
var a = x.slice(0),
    b = y.slice(0);

Array.prototype.push.apply(a, b);
ready

Revisions

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