Run results for: Spread Push VS Concat Reassign

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.122 Safari/537.36

Browser: Chrome 80

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 4 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);