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Run results for: Can JavaScript benefit from the ECS pattern 2?

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)

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Chrome 134
Mac OS X 10.15.7
Desktop
23 days ago
Test name Executions per second
OO-style 446.1 Ops/sec
ECS-style 337.7 Ops/sec
Script Preparation code:
​x
 
class Point {
  constructor(x, y) {
    this.x = x;
    this.y = y;
    this.health = 100;
  }
​
  tick() {
    this.x += 2;
    this.y += 2;
    this.health -= 1;
  }
}
​
var pointClasses = [];
var pointObjects = [];
​
for (let i = 0; i < 1000000; i++) {
  pointClasses.push(new Point(0, 0));
  pointObjects.push({ x: 0, y: 0 });
}
Tests:

  • OO-style

     
    pointClasses.forEach((point) => {
      point.tick();
      point.tick();
    });

  • ECS-style

     
    pointObjects.forEach((point) => {
      point.x += 2;
      point.y += 2;
      point.health -= 1;
      point.x += 2;
      point.y += 2;
      point.health -= 1;
    });