Sum up

gistfile1.txt

Context:
- object based..ref to object which owns current executing code
- look out for implicit binding 
- 'new' operator causes function to be called with 'this' bound to newly created object

Scope:
- function based..can be in function or Global

Prototype chain:
- delegates up prototype chain to function Object.
instanceDog -> Dog.prototype -> Animal.prototype -> Object.prototype

Closure:
- function which has acccess to scope/variable of outer function
- module pattern uses it
- lexical scope