Benchmark: Array concat vs spread vs push spread, loop, apply long arrays

Script Preparation code:

var subarrsBase = [
 [ "hello", true, 7 ],
 [ "yes", "no", "maybe", false, 27 ],
 [ 16, "I", "wonder", "what", "will", "be", "fastest"]
];

var subarrs = subarrsBase.map(arr => {
  let newArr = [...arr];
  for(let i = 0; i < 10; i++) {
    newArr = [...newArr, ...newArr];
  }
  return newArr;
})

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;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push Spread
Push Apply
Push Loop

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/111.0

Browser/OS: Firefox 111 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	5577.1 Ops/sec
spread operator	3334.4 Ops/sec
Push Spread	18581.5 Ops/sec
Push Apply	19248.6 Ops/sec
Push Loop	12875.4 Ops/sec

Array concat vs spread vs push spread, loop, apply long arrays (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: Array.prototype.concat vs spread operator vs Push Spread vs Push Apply vs Push Loop

Created: one year ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push Spread

Push Apply

Push Loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A