Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36
Chrome 91
Windows
Desktop
3 years ago
Test name Executions per second
subarray direct 6249748.0 Ops/sec
slice direct 5501198.5 Ops/sec
subarray copy 2170326.2 Ops/sec
slice copy 1843924.8 Ops/sec
subarray set 2181321.8 Ops/sec
slice set 2147453.0 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));