Run results for: flatten reduce vs for

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser: Chrome 91

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for	4827038.0 Ops/sec
reduce	3095272.5 Ops/sec

Script Preparation code:

var a = [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]

AخA
 
var a = [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]

Tests:

  const result = [];
  for (const item of a) result.push(...item);

​x
 
  const result = [];  for (const item of a) result.push(...item);​

const result = a.reduce((flat, el) => [...flat, ...el], []);

 
​const result = a.reduce((flat, el) => [...flat, ...el], []);