Run results for: Can JavaScript benefit from the ECS pattern 2? With split components position and health 4

JS arrays are weird and (probably?) not memory-contiguous, but just for kicks, let's see what difference there is (if any) between performing the same action on 1,000,000 objects in an object-oriented style (with the method attached to the object) vs an ECS-style (with the behavior separated from the raw data)

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Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:143.0) Gecko/20100101 Firefox/143.0

Browser: Firefox 143

Operating system: Linux

Device Platform: Desktop

Date tested: 9 months ago

OO-style

285/s

ECS-style

33/s

View exact numbers

Test name	Executions per second
✓ OO-style	285 Ops/sec
ECS-style	33 Ops/sec

Script Preparation code:

class Point {
    constructor(x, y) {
        this.x = x;
        this.y = y;
        this.health = 100;
    }

    updatePosition() {
        this.x += 2;
        this.y += 2;
    }

    takeDamage() {
        this.health -= 1;
    }
}

var pointClasses = [];

var pointCompList = [];
var healthCompList = [];

const entityCount = 1000000;

for (let i = 0; i < entityCount; i++) {
    pointClasses.push(new Point(0, 0));
    pointCompList.push({
        x: 0,
        y: 0
    });
    healthCompList.push(100);
}

Tests:

OO-style
for (let i = 0; i < entityCount; i++) { const pointClass = pointClasses[i]; pointClass.updatePosition(); pointClass.takeDamage(); pointClass.updatePosition(); pointClass.takeDamage(); };
ECS-style
function updatePosition(i) { const pointComp = pointCompList[i]; pointComp.x += 2; pointComp.y += 2; } function takeDamage(i) { healthCompList[i] -= 1; } for (let i = 0; i < entityCount; i++) { updatePosition(i); updatePosition(i); } for (let i = 0; i < entityCount; i++) { takeDamage(i); takeDamage(i); }