JavaScript Functions

 

•JavaScript Functions

–-Functions are first-class objects

–-Functions can be passed, returned, and stored just like any other value

–-Functions inherit from Object and can store name/value pairs.

–-A function is a reusable code-block that will be executed by an event, or when the function is called.

§function functionname(var1,var2,...,varX) {

§ some code

§ or

§ some code

§ return RETURNVALUE;

§}

–-function foo() {} expands to var foo = function foo() {}

•Inner Functions

-Functions do not all have to be defined at the top level (or left edge).

-Functions can be defined inside of other functions.

-Scope

§    An inner function has access to the variables and parameters of functions that it is contained within.

§    This is known as Static Scoping or Lexical Scoping.