Closures are expressions, typically functions, that have access to variables from an enclosing scope even after the scope has closed. Closures are created when a function is defined inside another function and the inner function is returned, preserving its access to variables in the outer function's scope. They allow protecting variables, keeping references for delayed execution, and implementing design patterns like the singleton.

1. Written by Dayi Chen Wow, CLOSURE!

2. What is the closure How to create a colsure Why colsure

3. WHAT IS THE COLSURE A "closure"is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the expression).

4. Free variable Bind variable Expression Execution context:global execution context and associated execution context Scope Chain,Scope,Activation object Global variable, Local variable,Parameter Function Higher order function

5. HOW TO CREATE A COLSURE Function -> Higher order function Function -> Object

6. WHY COLSURE Protect your variables Keep references for delayed execution Singleton pattern

7. OTHERS Closure in FP/OOP http://www.jibbering.com/faq/notes/closures/

8. Thank You