Run results for: push vs concat

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.1 Safari/605.1.15

Browser: Safari 11

Operating system: Mac OS X 10.13.4

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
.push()	4833.4 Ops/sec
.concat()	4.3 Ops/sec
.push() w/ .apply()	36995.5 Ops/sec
push apply alt	1807.8 Ops/sec

Script Preparation code:

function getArray() {
  var arr = new Array(1000);
  for (var i = 0; i < 1000; i++) {
    arr[i] = i;
  }
  return arr;
}

var arr = getArray();
var toAdd = getArray();

Tests:

.push()
for (var i = 0, iM = toAdd.length; i < iM; i++) { arr.push(toAdd[i]); }
.concat()
arr = arr.concat(toAdd);
.push() w/ .apply()
Array.prototype.push.apply(arr, toAdd);
push apply alt
arr.push.apply(arr, toAdd);

Run results for: push vs concat

.push()

.concat()

.push() w/ .apply()

push apply alt