Creating functions

DeclarationsVsExpresions.js

// Both ways to create functions use the function keyword, so the difference between them aren't immediately apparent.

//******************
// Declarations
//******************

// Variable declarations and functions declarations operate similiarly. They start with a keywords (var or function), followed by an identifier.
// Function declarations add lists of arguments in parentheses followed by blocks in curly braces.

function functionName(arg1, arg2, argN) {
  // Block of statements
}

// Javascript interpreters look at functions declarations before evertything else in the script, so you can call them before you declare them.

myFunc();

function myFunc(){
  // Statements
}

//******************
// Expresions
//******************

// You don't have to declare a name for a function and these are called 'function expressions'
// They are sometimes refered to as anonymous functions.
// You can store a function expression on a variable or use it as a return value in another function.

var functionName = function(arg1, arg2, argN) {
  // Statements
};

function outerFunction() {
  // This function returns an anonymous function
  return function() {
    console.log('inner function');
  };
}