MeasureThat.net

Run results for: JavaScript spread operator vs Slice/Splice performance - 2

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Chrome 130
Windows
Desktop
4 months ago
Test name Executions per second
Array clone with spread operator 15209120.0 Ops/sec
Array clone with slice 14302577.0 Ops/sec
Array addition with spread operator 6640580.5 Ops/sec
Array addition with slice and push 6685433.5 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 with spread operator

     
    const clone = [...list];

  • Array clone with slice

     
    const clone = list.slice();

  • Array addition with spread operator

     
    const clone = [...list, n];

  • Array addition with slice and push

     
    const clone = list.slice();
    clone.push(n);