CODEWITHSUNDEEP
javascriptbackbone.js
user1637281
user1637281

Reputation:

What is _events and what is it used for?

Searching backbone I see it is used 12 times and always attached to this inside of Backbone.Events.

Is it simply a property of Backbone.Events? If so why does it have the underscore prefix?

What is it used for?

on: function(name, callback, context) {
      if (!(eventsApi(this, 'on', name, [callback, context]) && callback)) return this;
      this._events || (this._events = {});
      var list = this._events[name] || (this._events[name] = []);
      list.push({callback: callback, context: context, ctx: context || this});
      return this;
    },

Upvotes: 1

Views: 2039

Answers (1)

Paul Hoenecke
Paul Hoenecke

Reputation: 5060

The underscore is meant to indicate that it should be treated as a private property. _events is a map of event callbacks used by Backbone.Events.

Any property or method added to a javascript object is public. The underscore is a widely used convention to show that the property/method is not to be used outside of the object.

Here is a classic link that explains it a bit: http://javascript.crockford.com/private.html

Upvotes: 4

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