JavaScript Function Declaration Patterns

function.js

// Style #1
function foo() {
   //do something
}


//Style #2
var foo = function(){
   //do something
}


//Style #3
var foo = function bar(){
   //do something
}

Style 1. is a statement/declaration that creates a function named foo with a reference called foo
Style 2. is an expression that creates an anonymous function & assigns it to a reference called foo
Style 3. ia an expression that creates a function named bar & assigns it to a reference called foo

Style-1 is hoisted, so you can use the function before the actual definition.
foo() before style 2 or 3 will give an error.
Also during function calls & error-stack generation the function name is used.

Extensive info at http://stackoverflow.com/questions/336859/javascript-var-functionname-function-vs-function-functionname