Run results for: concat vs push

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
concat	641651.4 Ops/sec
push	4181.9 Ops/sec

Script Preparation code:

var someBigArray = [];
var anotherArray = [];

for (var i = 0; i < 1000; i++) {
  someBigArray.push(10);
  anotherArray.push(10);
}

Tests:

concat
var thing = someBigArray.concat(anotherArray);
push
var thing = [] someBigArray.forEach(function(item) { thing.push(anotherArray); }); anotherArray.forEach(function(item) { thing.push(anotherArray); });