Javascript Closures illustrated

closures.js

functionCreator = function(favouriteNumber) {
	return function(inputNumber) {  // <-- This function is a closure!
		console.log("You input the number " + inputNumber + ", and your favourite number is " + favouriteNumber + ".");
		
		if(inputNumber === favouriteNumber) {
			console.log("Those are the same number!");
		} else {
			console.log("Those are NOT the same number!");
		}
	}
}

numberFunc = functionCreator(7);
numberFunc(7); // You input the number 7, and your favourite number is 7. Those are the same number!
numberFunc(13); // You input the number 13, and your favourite number is 7. Those are NOT the same number!

// Now let's do it a little briefer... Note how we just directly call the return value, rather than assigning it to `numberFunc` first.

functionCreator(7)(13); // You input the number 13, and your favourite number is 7. Those are NOT the same number!