@cch137/emitter/group.js

`@cch137/emitter` is a versatile event emitter package designed to work seamlessly in both browser and Node.js environments. It provides a simple yet powerful interface for managing event-driven architecture in your applications.

export default class Group extends Array {
    static Group = Group;
    constructor(...items) {
        super(...items);
    }
    add(...items) {
        items.forEach((item) => {
            if (!this.has(item))
                this.push(item);
        });
        return this;
    }
    delete(item) {
        let found = false;
        for (let i = this.length - 1; i > -1; i--) {
            if (this[i] === item) {
                this.splice(i, 1);
                if (!found)
                    found = true;
            }
        }
        return found;
    }
    deleteLast(item) {
        for (let i = this.length - 1; i > -1; i--) {
            if (this[i] === item) {
                this.splice(i, 1);
                return true;
            }
        }
        return false;
    }
    deleteOne(item) {
        const length = this.length;
        for (let i = 0; i < length; i++) {
            if (this[i] === item) {
                this.splice(i, 1);
                return true;
            }
        }
        return false;
    }
    has(item) {
        return this.includes(item);
    }
    clear() {
        this.splice(0);
    }
}
export { Group };
export class Collection extends Map {
    group(key) {
        if (super.has(key))
            return super.get(key);
        const g = new Group();
        return super.set(key, g), g;
    }
    once(key) {
        const g = super.get(key);
        return super.delete(key), g;
    }
    trim() {
        [...this].forEach(([k, g]) => {
            if (g.length === 0)
                this.delete(k);
        });
    }
}
export class WeakCollection extends WeakMap {
    group(key) {
        if (super.has(key))
            return super.get(key);
        const g = new Group();
        return super.set(key, g), g;
    }
    once(key) {
        const g = super.get(key);
        return super.delete(key), g;
    }
}