Introduction to javascript functions.

1. The good parts for humans
(part 2)
B Anjaneyulu Reddy
Email: anji.t6@gmail.com
Twitter: @_anji
Evibe.in
JavaScript

2. Agenda
Day 1 revisit
Introduction to Functions

3. Day 1 revisit
Reserved keywords - ECMAScript 5
JSON recommendation
FPS quesiton
What are the falsy values?
Global abatement
Prototypal inheritance

4. Functions (1 of 2)
What is a function?
Function are objects in JS
• stored in variables, objects, arrays
• passed as arguments to functions
• functions can be returned from functions
• functions can have methods
Hidden properties
o Function.prototype
o function's context
o code that implements function's behaviour
functionObject.prototype
functions are invoked

5. Functions (2 of 2)
• Function literal
o Four parts
 function keyword
 optional function name
• used for self calls
 parameters
 body of the function - set of statements
o can be defined in another function
• this, arguments
• Function Invocation: invocation operator - expression(a, b, ...)
o differ in what this is assigned to
o four patterns
 function form
 method form
 constructor form
 apply form

6. Questions?

7. Thank You