MeasureThat.net

Run results for: slice VS splice (clone) VS shift: who is the fastest to keep constant size

100k list splice and shift win, they mutate list slice loose, it creates a copy of list 7.5x slower

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.87 Safari/537.36
Chrome 78
Windows
Desktop
5 years ago
Test name Executions per second
slice 58.8 Ops/sec
splice 137.4 Ops/sec
shift 1355.0 Ops/sec
Script Preparation code:
AخA
 
var list = [];
for (var i = 0; i < 1000 * 1000; i++) {
  list.push(i);
}
Tests:

  • slice

     
    list.push('slice');
    list = list.slice(1);

  • splice

     
    list.push('splice');
    var clone = [...list];
    clone.splice(0, 1);

  • shift

     
    list.push('splice');
    list.shift();