Run results for: Array.prototype.concat vs spread operator - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
slice	16394720.0 Ops/sec
spread operator	13661420.0 Ops/sec
concat into empty array	9127083.0 Ops/sec
Array.from	4502038.0 Ops/sec

Website performance monitoring

Script Preparation code:

var myArray = [ "hello", true, 7 ]

Tests:

slice
var other = myArray.slice();
spread operator
var other = [ ...myArray ]
concat into empty array
[].concat(myArray);
Array.from
var other = Array.from(myArray);