the-world-engine/dist/esm/engine/physics/2d/Collision2DPool.js

three.js based, unity like game engine for browser

import { Collision2D } from "./Collision2D";

export class Collision2DPool {
    io=[];
    getInstance() {
        if (this.io.length > 0) {
            return this.io.pop();
        }
        return new Collision2D;
    }
    release(o) {
        this.io.push(o);
    }
}