Javascript - How to Declare and Invoke a Function

USE FUNCTION LITERALS (FUNCTION DECLARATIONS & FUNCTION EXPRESSIONS) TO DECLARE FUNCTIONS, JUST BE CONSISTENT

YOU NEED PARENTHESIS TO INVOKE A FUNCTION

FUNCTIONS HELP ENFORCE THE DRY (DON'T REPEAT YOURSELF) PRINCIPLE BY KEEPING ALL THE FUNCTIONALITY IN ONE PLACE SO YOU ONLY HAVE TO UPDATE THE CODE IN ONE PLACE

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