Run results for: Spread Push VS Concat Reassign

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.104 Safari/537.36 Vivaldi/1.91.867.42

Browser: Chrome 59

Operating system: Mac OS X 10.12.5

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Spread Push	632789.0 Ops/sec
Concat Reassign	775959.6 Ops/sec
Apply Push	1067291.1 Ops/sec

Script Preparation code:

var data = [
  1, 2, 3, 4,
  [1, 2, 3, 4],
  5, 6, 7, 8,
  [1, 2, 3, 4]
];

Tests:

Spread Push
(function fn(items){ var result = []; items.forEach(item => { if(item.pop) { result.push(...fn(item)); } else { result.push(item); } }); return result; })(data);
Concat Reassign
(function fn(items){ var result = []; items.forEach(item => { if(item.pop) { result = result.concat(fn(item)); } else { result.push(item); } }); return result; })(data);
Apply Push
(function fn(items){ var result = []; items.forEach(item => { if(item.pop) { result.push.apply(result, fn(item)); } else { result.push(item); } }); return result; })(data);

Run results for: Spread Push VS Concat Reassign

Spread Push

Concat Reassign

Apply Push