Push vs length

JavaScript performance comparison

Revision 4 of this test case created on 11th December 2012

Array population in javascript - push vs array.length

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Test Ops/sec

Testing in unknown unknown
Test	Ops/sec
length	`var myArray = []; for (var i = 0; i < 100; i++) { myArray[myArray.length] = 'foo'; myArray[myArray.length] = 'bar'; } myArray.join("");`	pending…
push	`var myArray = []; for (var i = 0; i < 100; i++) { myArray.push('foo'); myArray.push('bar'); } myArray.join("");`	pending…
append	`var str = ""; for (var i = 0; i < 100; i++) { str += 'foo'; str += 'bar'; }`	pending…

length

var myArray = [];

for (var i = 0; i < 100; i++) {
  myArray[myArray.length] = 'foo';
  myArray[myArray.length] = 'bar';
}
myArray.join("");

pending…

push

var myArray = [];

for (var i = 0; i < 100; i++) {
  myArray.push('foo');
  myArray.push('bar');
}
myArray.join("");

pending…

append

var str = "";

for (var i = 0; i < 100; i++) {
  str += 'foo';
  str += 'bar';
}

pending…

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