Run results for: teardown + simple versus get x versus array[0] versus Float32Array versus Float32Array get versus Int32Array versus Int32Array extended

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

simple 3

12K/s

simple 2

12K/s

array[0] 2

10K/s

array[0]

9K/s

extended float 32

9K/s

float 32

9K/s

extended int 32

9K/s

int 32

9K/s

simple

1K/s

set / get

1K/s

View exact numbers

Test name	Executions per second
✓ simple 3	11,626 Ops/sec
simple 2	11,529 Ops/sec
array[0] 2	9,574 Ops/sec
array[0]	9,386 Ops/sec
extended float 32	9,091 Ops/sec
float 32	8,900 Ops/sec
extended int 32	8,863 Ops/sec
int 32	8,791 Ops/sec
simple	1,145 Ops/sec
set / get	1,117 Ops/sec

HTML Preparation code:

<span id="foo"></span>

Script Preparation code:

const span = document.getElementById ("foo");

class Float32ArrayExtended extends Float32Array {
  
  constructor (val) {
    super(1);
    this[0] = val;
  }

  get x () { return this[0]; }
  set x (v) { this[0] = v; }
}

class Int32ArrayExtended extends Int32Array {
  
  constructor (val) {
    super(1);
    this[0] = val;
  }

  get x () { return this[0]; }
  set x (v) { this[0] = v; }
}

const size = 10000;
const array = new Array(16).fill(1);
const arrayEF32 = new Float32ArrayExtended (16);
const arrayF32 = new Float32Array (16);
const arrayEI32 = new Int32ArrayExtended (16);
const arrayI32 = new Int32Array (16);
let x = 1;

const obj = {
    get x() {
        return array[0];
    },

    set x(value) {
        array[0] = value;
    }
};

Tests:

array[0]
let sum = 0; for (let i = 0; i < size; i++) { array[0] = Math.random () * 1000; sum += array[0]; } foo.innerText = sum;
set / get
let sum = 0; for (let i = 0; i < size; i++) { obj.x = Math.random () * 1000; sum += obj.x; } foo.innerText = sum;
float 32
let sum = 0; for (let i = 0; i < size; i++) { arrayF32[0] = Math.random () * 1000; sum += arrayF32[0]; } foo.innerText = sum;
extended float 32
let sum = 0; for (let i = 0; i < size; i++) { arrayEF32.x = Math.random () * 1000; sum += arrayEF32.x; } foo.innerText = sum;
int 32
let sum = 0; for (let i = 0; i < size; i++) { arrayI32[0] = Math.random () * 1000; sum += arrayI32[0]; } foo.innerText = sum;
extended int 32
let sum = 0; for (let i = 0; i < size; i++) { arrayEI32.x = Math.random () * 1000; sum += arrayEI32.x; } foo.innerText = sum;
simple
let sum = 0; for (let i = 0; i < size; i++) { x = Math.random () * 1000; sum += x; } foo.innerText = sum;
array[0] 2
let sum = 0; for (let i = 0; i < size; i++) { array[0] = Math.random () * 1000; sum += array[0]; } foo.innerText = sum;
simple 2
let sum = 0; for (let i = 0; i < size; i++) sum += Math.random () * 1000; foo.innerText = sum;
simple 3
let sum = 0; for (let i = 0; i < size; i++) { const x = Math.random () * 1000; sum += x; } foo.innerText = sum;