Run results for: Array concat vs spread opearator with diffrent test case sizes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36

Browser: Chrome 80

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Array.prototype.concat params: 1000, other 2	277872.7 Ops/sec
spread operator params: 1000, other 2	120564.1 Ops/sec
Push params: 1000, other 2	173379.0 Ops/sec
Array.prototype.concat params: 1000, other 1000	178656.6 Ops/sec
spread operator params: 1000, other 1000	90884.3 Ops/sec
Push params: 1000, other 1000	120372.0 Ops/sec
Array.prototype.concat params: 2, other 2	1094334.9 Ops/sec
spread operator params: 2, other 2	1438739.8 Ops/sec
Push params: 2, other 2	1463541.6 Ops/sec
Array.prototype.concat params: 2, other 1000	304702.4 Ops/sec
spread operator params: 2, other 1000	193332.6 Ops/sec
Push params: 2, other 1000	295238.1 Ops/sec

Tests:

Array.prototype.concat params: 1000, other 2
var params = new Array(1000); params.fill(0); var other = new Array(2).fill(0).concat(params);
spread operator params: 1000, other 2
var params = new Array(1000); params.fill(0); var other = [ new Array(2).fill(0), ...params ]
Push params: 1000, other 2
var params = new Array(1000).fill(0); var other = new Array(2).fill(0).push(...params);
Array.prototype.concat params: 1000, other 1000
var params = new Array(1000).fill(0); var other = new Array(1000).fill(0).concat(params);
spread operator params: 1000, other 1000
var params = new Array(1000).fill(0); var other = [ ...new Array(1000).fill(0), ...params ]
Push params: 1000, other 1000
var params = new Array(1000).fill(0); var other = new Array(1000).fill(0).push(...params);
Array.prototype.concat params: 2, other 2
var params = new Array(2).fill(0); var other = new Array(2).fill(0).concat(params);
spread operator params: 2, other 2
var params = new Array(2).fill(0); var other = [ ...new Array(2).fill(0), ...params ]
Push params: 2, other 2
var params = new Array(2).fill(0); var other = new Array(2).fill(0).push(...params);
Array.prototype.concat params: 2, other 1000
var params = new Array(2).fill(0); var other = new Array(1000).fill(0).concat(params);
spread operator params: 2, other 1000
var params = new Array(2).fill(0); var other = [ ...new Array(1000).fill(0), ...params ]
Push params: 2, other 1000
var params = new Array(2).fill(0); var other = new Array(1000).fill(0).push(...params);