Run results for: Spread Push VS Concat Reassign

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:48.0) Gecko/20100101 Firefox/48.0

Browser: Firefox 48

Operating system: Mac OS X 10.11

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
Spread Push	145238.8 Ops/sec
Concat Reassign	199126.5 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);