Run results for: spread vs concat vs unshift 213124 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Browser: Chrome 74

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
arrayUnshift123	2891.7 Ops/sec
arrayConcat123	153.1 Ops/sec
arraySpread123	37.8 Ops/sec
arrayUnshiftApply	955.5 Ops/sec

Website performance monitoring

Script Preparation code:

var array = [1,2,3];
var array2 = [-1,-2,-3];

Tests:

arrayUnshift123
array.unshift(...array2);
arrayConcat123
array = array2.concat(array)
arraySpread123
array = [...array2, ...array]
arrayUnshiftApply
array.unshift.apply(array, array2)