Method off

src/js/evented.js:20–37

(event, handler)

  }

  off(event, handler) {
    if (isUndefined(this.bindings) ||
      isUndefined(this.bindings[event])) {
      return this;
    }

    if (isUndefined(handler)) {
      delete this.bindings[event];
    } else {
      this.bindings[event].forEach((binding, index) => {
        if (binding.handler === handler) {
          this.bindings[event].splice(index, 1);
        }
      });
    }

    return this;
  }

  trigger(event, ...args) {
    if (!isUndefined(this.bindings) && this.bindings[event]) {