@mousepox/util/dist/es/Collection.js

Miscellaneous utilities

import { Signal } from "./Signal";
export class Collection {
    constructor() {
        this.onAdd = new Signal();
        this.onRemove = new Signal();
        this.things = new Map();
    }
    get size() {
        return this.things.size;
    }
    clear() {
        this.things.clear();
    }
    dispose() {
        this.onAdd.purge();
        this.onRemove.purge();
        this.clear();
    }
    add(key, thing) {
        this.things.set(key, thing);
        this.onAdd.emit(thing);
    }
    remove(key) {
        const thing = this.things.get(key);
        if (thing !== undefined) {
            this.things.delete(key);
            this.onRemove.emit(thing);
        }
    }
    get(key) {
        return this.things.get(key);
    }
    each(fn, filter) {
        for (const [key, thing] of this.things) {
            if (filter === undefined || filter(thing)) {
                fn(thing, key);
            }
        }
    }
    count(filter) {
        let count = 0;
        for (const [, thing] of this.things) {
            if (filter(thing)) {
                count++;
            }
        }
        return count;
    }
    filter(filter) {
        const things = [];
        for (const [, thing] of this.things) {
            if (filter === undefined || filter(thing)) {
                things.push(thing);
            }
        }
        return things;
    }
    first(filter) {
        for (const [, thing] of this.things) {
            if (filter(thing)) {
                return thing;
            }
        }
    }
}