When to use return, and what happens to returned data?

Question

What is the difference between:

function bla1(x){console.log(x)}

and

function bla(x){return console.log(x)}

I

Answer 1

Return in a function is a way to pass back data from the function.

Example:

function test(){
   var test = 1+1;
   return test;
}

var feedback = test(); //feedback would now contain the value 2 if outputted.

We could also send a variable into the function and then return it back out.

Example 2:

 function test(i){
    i= i+1;
    return i;
 }

 var feedback = test(1); //feedback would also output the value 2.