JavaScript: Getting Closure
summary
Explains how immediately invoked function expressions work as a one-time wrapper, showing the exact parentheses trick, passing window and an undefined parameter to avoid older-ES quirks, and why libraries like jQuery, Backbone and CoffeeScript compile into IIFEs. Demonstrates concrete patterns: a module that returns a public API while hiding a private counter, the for-loop handler fix that uses a factory to seal each i value, and the fact that a closure retains original scope enabling private state and an emulated block scope until ES6 let arrives.
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chapters (24)
- 0:00Intro
- 0:43Immediately Invoked Function Expressions
- 1:05Immediately Invoked
- 1:23Function Expressions
- 1:59Why is the difference important
- 2:24Do you always need parentheses
- 3:01Not the only way
- 3:11jQuery Sauce
- 3:53jQuery Plugins
- 4:38CoffeeScript
- 4:48nmloop
- 5:13Protecting Globals
- 5:54If
- 6:37One Statement
- 7:35Emulate Block Scope
- 8:48Copy Script
- 9:35Public Functions
- 10:08What is a Closure
- 11:07Closures are Useful
- 11:37Anonymous Functions
- 12:14SelfExecuting Anonymous Functions
- 12:39Naming Functions
- 13:23Wrapping
- 14:27Outro
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