Hyper Private Variables in Javascript

Or, a merry romp through the fields of "why are javascript objects kinda weird"?

Transcript

1. Hyper-Private Variables in JavaScript @veganben
3. Netscape Naviagtor Asynchronous Prototype based Influenced by C, Self, Scheme
4. An evolving langauge TC 39 JS Lint & JSON Coffee Script
5. Patterns
6. Objects
7. Getting Started:
8. Array.prototype.last = function(){ return this[this.length-1] } var theEnd = [1,2,3,4,5].last(); >> 5
9. Object.defineProperty(Array.prototype, 'last', { enumerable: false, configurable: true, get: function() { return this[this.length - 1]; }, set: undefined });
10. Constructor: function Message(param) { this.greeting = param; } Instantiation: var helloMessage = new Message('hello');
11. prototype inheritance: Message.prototype.greet = function (who) { return this.greeting + " " + who; } method invocation: var greeting = helloMessage.greet("world"); >> “hello world” function Message(param) { this.greeting = param; } var sayHello = new Message('hello');
12. Public and Private:
13. function Message(param) { var greetedCount = 0; this.greeeting = param; }
14. function Message(param) { var greetedCount = 0; this.incrementGreeted = function(){ greetedCount++; } this.greeeting = param; }
15. var myModule = (function () { var privateStuff; var publicStuff; return { visible: publicStuff }
16. function Counter() { var increment, decrement, get; (function() { var privateCount = 0; increment = function() { return count++ }; decrement = function() { return count--; }; get = function() { return privateCount; }; })(); this.set = function(param) { if(param >=0 ){ increment(); } else { decrement } }; this.getCount = function() { return get(); } }
17. var filmCount = new Count(); filmCount.set(1); filmCount.getCount();
18. for example