There are about a hundred terminology issues here, mostly built around someone (not you) trying to make their idea sound like The Best. All object oriented languages need to be able to deal with several concepts: encapsulation of data along with associated operations on the data, variously known as data members and member functions, or … Read more
Yes, the first function has no relationship with an object instance of that constructor function, you can consider it like a ‘static method’. In JavaScript functions are first-class objects, that means you can treat them just like any object, in this case, you are only adding a property to the function object. The second function, … Read more
I know that this answer is 3 years late but I really think the current answers do not provide enough information about how prototypal inheritance is better than classical inheritance. First let’s see the most common arguments JavaScript programmers state in defence of prototypal inheritance (I’m taking these arguments from the current pool of answers): … Read more
I know that this question has an accepted answer but I thought I’d chip in with an alternative which uses array.reduce, seeing that summing an array is the canonical example for reduce: $scope.sum = function(items, prop){ return items.reduce( function(a, b){ return a + b[prop]; }, 0); }; $scope.travelerTotal = $scope.sum($scope.traveler, ‘Amount’); Fiddle
Using the prototype makes faster object creation since properties/methods on the prototype don’t have to be re-created each time a new object is created. When you do this: function animal() { this.name=”rover” this.set_name = function (name) { this.name = name } } The set_name method is created every time you create an animal. But when … Read more
I’ve been trying to wrap my head around this recently and finally came up with this “map” that I think sheds full light over the matter http://i.stack.imgur.com/KFzI3.png I know I’m not the first one making this up but it was more interesting figuring it out that finding it :-). Anyway, after that I found e.g. … Read more
For preserving the context, the bind method is really useful, it’s now part of the recently released ECMAScript 5th Edition Specification, the implementation of this function is simple (only 8 lines long): // The .bind method from Prototype.js if (!Function.prototype.bind) { // check if native implementation available Function.prototype.bind = function(){ var fn = this, args … Read more