Almost everything is an object.

• Primitives: numbers, booleans, strings, null, undefined
• Objects: Math, Date, JSON, window, document, objects you create, array, function, numbers, booleans, strings

Functions are “first class” values.

• Assign a function to a variable.
• Store a function as a value in an array or object.
• Pass a function to a function.
• Return a function from a function.

Primitives don’t look like objects.

var phoneNumber = "555-1212";	//phoneNumber is a primitive.
console.log(phoneNumber.length);//Now we need phoneNumber to be an object.
/*********************
*	BEHIND THE SCENES
*
*	phoneNumber is converted to a string object.
*	.length property is then accessed
*	
**********************/	
console.log(phoneNumber);		//phoneNumber is a primitive again.

Here are the Eight Terminal Utilities Every OS X Command Line User Should Know as well as An A-Z Index of the Apple OS X command line.

Best Practices:

• Choose short but readable variable names.
• Avoid global variables.
• Use only one global object to encapsulate any global variables you really need.
• Always use var to declare your variables.
• Indent your code so it’s readable.
• Use curly braces to define blocks of code.
• Comment your code.
• Always use semi-colons.
• Be aware of where automatic semi-colon insertion happens.
• Declare variables outside loops.
• Reduce DOM operations.