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Run results for: JavaScript spread vs slice vs for

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36
Chrome 86
Windows
Desktop
4 years ago
Test name Executions per second
Array clone: spread operator 10444540.0 Ops/sec
Array clone: slice 11057238.0 Ops/sec
Array Clone: for loop 11680545.0 Ops/sec
Script Preparation code:
​x
 
const ITERATIONS = 500000;
var index = ITERATIONS/2;
var n = Math.random();
​
var list = [];
for (let i = 0; i < length; i += 1) {
  list.push(Math.random());
}
Tests:

  • Array clone: spread operator

     
    const clone = [...list];

  • Array clone: slice

     
    const clone = list.slice();

  • Array Clone: for loop

     
    const clone = [];
    for (let i=0;i<list.length;i++) {
    clone[i] = list[i];
    }