Node.js模块：引用同级函数的正确方法

Question

This is my current code:

var PermissionsChecker = {};

PermissionsChecker.check = function(id) {
  PermissionsChecker.getPermissions(id);
}

PermissionsChecker.getPermissions = function(id) {
  // do stuff
}

Two questions:

1. Is this the right way to construct node.js functions?
2. Is that line in .check the correct way to refer to a sibling function?

Thanks!

Answer 1

So long as the function is called with PermissionsChecker.check() , you can refer to the object with this .

CodePad .

Answer 2

What you've done above is called an object literal, but you could choose the prototypal way also (when you need to instantiate objects - OOP stuff).

You can call this inside to refer to another object property:

PermissionsChecker.check = function(id) {
  this.getPermissions(id);
}

Answer 3

It's perfectly fine. Some notes:

• Sibling function isn't really any standard term for methods of the same object. Minor note, but could cause confusion.

• When a function is called as a method on some object, then the value of this inside that function refers to the object on which it was called. That is, calling check like this:

   PermissionsChecker.check() 

  ...allows you to write the function like this:

   PermissionsChecker.check = function(id) { this.getPermissions(id); } 

  ...which is more succinct and probably more common.

• Nothing about your question is specific to node.js. This applies to JavaScript in the browser (or anywhere else), too.

• You could save some typing by rewriting your example like this:

   var PermissionsChecker = { check: function(id) { this.getPermissions(id); }, getPermissions: function(id) { // do stuff } };