the-world-engine/dist/esm/engine/collection/MutIteratableCollection.js

three.js based, unity like game engine for browser

import { OrderedSet } from "js-sdsl";

export class MutIteratableCollection {
    rt=null;
    nt;
    dt;
    ft;
    ut;
    constructor(t) {
        this.nt = new OrderedSet(undefined, t);
        this.dt = new OrderedSet(undefined, t);
        this.ft = new OrderedSet(undefined, t);
        this.ut = new OrderedSet(undefined, t);
    }
    get size() {
        return this.nt.size();
    }
    insert(t) {
        t.isRemoved = false;
        if (this.rt !== null) {
            this.dt.insert(t);
            this.ut.eraseElementByKey(t);
        } else this.nt.insert(t);
    }
    delete(t) {
        if (this.rt !== null) {
            t.isRemoved = true;
            this.dt.eraseElementByKey(t);
            this.ut.insert(t);
        } else this.nt.eraseElementByKey(t);
    }
    clear() {
        this.nt.clear();
        this.dt.clear();
        this.ut.clear();
    }
    forEach(t) {
        this.rt = this.nt;
        this.rt.forEach((e => {
            if (!e.isRemoved) t(e);
        }));
        do {
            this.rt = this._t();
            this.rt.forEach((e => {
                if (!e.isRemoved) t(e);
            }));
        } while (0 < this.dt.size() || 0 < this.ut.size());
        this.rt = null;
    }
    _t() {
        this.rt = null;
        this.ut.forEach((t => this.delete(t)));
        this.dt.forEach((t => this.insert(t)));
        const t = this.dt;
        this.dt = this.ft;
        this.ft = t;
        this.dt.clear();
        this.ut.clear();
        return t;
    }
}