Run results for: Spread Push VS Concat Reassign

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1

Browser: Mobile Safari 10

Operating system: iOS 10.0.1

Device Platform: iPad

Date tested: 8 years ago

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);