Question

MyClass = function() {
    var init = function() {
        console.log("Initializing");
    }
    this.init();
}
var myInstance = new MyClass();

When I run the above I get

TypeError: Object [object Object] has no method ‘init’

Answer 1

It’s because by declaring init as a var, or a local variable rather than a property of the object. As such, init does not become a member function of your object, which is why your code failed to run as you expected. Initialize it as this.init = function() { instead to achieve the expected behaviour.

http://jsfiddle.net/Y2Rvq/