prototypal-inheritance

I'm seeing posts about a 'new' Object.create that makes enumeration configurable. However, it relies on a Object.defineProperty method. I can't find a cross browser implementation for this method. Are we stuck writing for the old Object.create? I can't write things that won't work in IE6/7. There are several things that you can't emulate from the ECMAScript 5 Object.create method on an ECMAScript 3 environment. As you saw, the properties argument will give you problems since in E3-based implementations there is no way to change the property attributes. The Object.defineProperty method as

I am attempting to pass a test suite utilizing inheritance through JavaScript. Below is a snippet of the code I have so far: var Infant = function() { this.age = 0; this.color = 'pink'; this.food = 'milk'; }; Infant.prototype.eat = function(){ return this.eat; } var Adolescent = function() { this.age = 5; this.height = 'short'; this.job = 'keep on growing'; }; I would like to inherit the food property from the Infant class and the eat method but my attempts have fallen short. my initial thought was to assign this.Adolescent = Infant.food; but that didn't work. I know I need to set Infant as

I have a JavaScript function object as; var addNum = function(num1, num2) { return num1 + num2; } Now if I try to access addNum.divide() I wanted to understand the prototype chain for the above code. I read that in the above example, addNum would be searched for divide(), followed by Function.prototype and finally Object.prototype. But my question is in the above example, how can addNum would be searched for divide() Does it refer to something like ; var addNum = function(num1, num2) { this.divide = function(){} return num1 + num2; } I could not understand the line where it says addNum would