What is a best practice for ensuring “this” context in Javascript?

Question

Here\'s a sample of a simple Javascript class with a public and private method (fiddle: http://jsfiddle.net/gY4mh/).

function Example() {
    function privateFun         


        

Answer 1

I guess most used way to get this done is by simply caching (storing) the value of this in a local context variable

function Example() {
    var that = this;
    // ...
    function privateFunction() {
        console.log(that);
    }

    this.publicFunction = function() {
       privateFunction();
    }
}

a more convenient way is to invoke Function.prototype.bind to bind a context to a function (forever). However, the only restriction here is that this requires a ES5-ready browser and bound functions are slightly slower.

var privateFunction = function() {
    console.log(this);
}.bind(this);