Run results for: slice vs subarray vs set custom

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

subarray direct

57.2M/s

slice direct

44.0M/s

subarray copy

32.7M/s

subarray set

31.4M/s

slice copy

27.1M/s

slice set

25.2M/s

View exact numbers

Test name	Executions per second
✓ subarray direct	57,162,208 Ops/sec
slice direct	43,982,132 Ops/sec
subarray copy	32,688,904 Ops/sec
subarray set	31,355,958 Ops/sec
slice copy	27,145,026 Ops/sec
slice set	25,186,506 Ops/sec

Script Preparation code:

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 u8 = new Uint8Array(data);

Tests:

subarray direct
var copy = u8.subarray(10, 20);
slice direct
var copy = u8.slice(10, 20);
subarray copy
var copy = new Uint8Array(u8.subarray(10, 20));
slice copy
var copy = new Uint8Array(u8.slice(10, 20));
subarray set
var copy = new Uint8Array(10).set(u8.subarray(10, 20));
slice set
var copy = new Uint8Array(10).set(u8.slice(10, 20));