JavaScript Event System

Event.js

const Event = {
    events: {},

    on(event, func) {
        if (!this.events.hasOwnProperty(event)) {
            this.events[event] = [];
        }

        this.events[event].push(func);
    },

    fire(event, data) {
        if (!this.events.hasOwnProperty(event)) {
            return;
        }

        this.events[event].map(func => func(data));
    },

    off(event) {
        if (!this.events.hasOwnProperty(event)) {
            return;
        }

        this.events[event].splice(0, this.events[event].length - 1);

        if (this.events[event].length === 0) {
            delete this.events[event];
        }
    }
};

export default Event;

Usage:

// Listen for events
Event.on('something', (data) => console.log(data));

// Fire events
Event.fire('something', {someKey: 'some value'});

// Remove events
Event.off('something');