A simple event repository. (bugged)

events.js

var Events = {

  registry: {},

  nameExists: function(name) {
    return typeof this.registry[name] !== 'undefined';
  },

  on: function(name, callback) {
    if ( ! this.nameExists(name)) {
      this.registry[name] = [];
    }
    this.registry[name].push(callback);
  },

  off: function(name) {
    if (this.nameExists(name)) {
      delete(this.registry[name]);
    }
  },

  trigger: function(name, data) {
    if ( ! this.nameExists(name)) {
      return;
    }
    this.registry[name].forEach(function(callback) {
      callback(data);
    });
  }

};