Javascript - Focus on Functions

js-focus-on-functions

--> Focus on FUNCTIONS IN JAVACRIPT


### Using callbacks in JavaScript (how to pass functions as arguments to other functions)

	function doSomethingCool() {
		//
	}

	$('someElement').click( doSomethingCool );



### Passing named functions vs. passing anonymous functions

	Same thing as above using anon function:

	$('someElement').click( function() {
		// contents of anonymous function.
	});


	$('someElement').click( function(){ } );		// same as above on one line



### Composing and writing functions

### What arguments are provided to each function, and what are their types? 

	The arguments object is a local variable available within all function.

	It is similar to an Array, but does not have any Array properties except length.

	Other Properties
		arguments.callee : Reference to the currently executing function.



### What gets returned out of a function, if anything? 

	If you don't specify, then undefined is returned,
	
	return;  // Also, return by itself like this returns undefined too.
	
	
### How and when do you use anonymous functions?

	When you don't need to pass the same function anywhere else, there's no need to name it.

### What does it mean to be a higher-order function, and how are they composed?

	Functions that either take in other functions as parameters, or functions that return functions.
	
	So, callbacks are higher order functions.