Run details:
Mozilla/5.0 (Linux; Android 10; SM-G965F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.86 Mobile Safari/537.36
Chrome Mobile 89
Android
Mobile
3 years ago
Test name Executions per second
subarray direct 2705324.5 Ops/sec
slice direct 2245688.5 Ops/sec
subarray copy 961779.9 Ops/sec
slice copy 906203.3 Ops/sec
subarray set 998655.0 Ops/sec
slice set 917469.6 Ops/sec
Script Preparation code:
AخA
 
var data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
var f32 = new Float32Array(data);
Tests:
  • subarray direct

     
    var copy = f32.subarray(10, 20);
  • slice direct

     
    var copy = f32.slice(10, 20);
  • subarray copy

     
    var copy = new Float32Array(f32.subarray(10, 20));
  • slice copy

     
    var copy = new Float32Array(f32.slice(10, 20));
  • subarray set

     
    var copy = new Float32Array(10).set(f32.subarray(10, 20));
  • slice set

     
    var copy = new Float32Array(10).set(f32.slice(10, 20));