What is the purpose of 'return'?


#1

Hello!

Can someone please explain to me what the purpose of return is? When do we use it? Why is it better than print console.log?

4 says at the bottom of the hint:
Because we are defining a function, we can make use of the return keyword!

I don't understand this.

Thanks!


#2

@cloudsurfer41180

I guess this means that console.log will print out on the browser's console while the return will return value in a function. For more information, you can check this link: Codeacademy: Difference between return and console.log


#3

@cloudsurfer41180,

function with 1 parameter using return-statement

var myFunction = function( param1 ) {
       //Begin of FUNCTION-BODY
       //myFunction =function= has 1 PARAMETER param1
       //this param1 PARAMETER is used as a -local- VARIABLE
       //throughout the FUNCTION-BODY

      return param1;

      //End of FUNCTION-BODY
      };

you have defined a myFunction function
which takes 1 parameter param1
this param1 parameter is used
as a variable throughout the FUNCTION-BODY.

If you want to call/execute this myFunction function
and this myFunction function was defined
as having 1 parameter param1
you will have to provide 1 argument
in our case a "number VALUE" 4
myFunction( 4 );

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

============================================

As you are using the return-statement in your myFunction function
you will only get a return-value no-display.
You can however capture this return-value in a variable
and then use the console.log()-method to do a display.

var theResult = myFunction( 4 );
console.log( theResult );

OR directly

console.log( myFunction( 4 ) );

Reference::

google search
== the book ==
javascript return statement site:developer.mozilla.org
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return
== discussions / opinions ==
javascript return statement site:stackoverflow.com
http://stackoverflow.com/questions/3717420/is-there-a-benefit-to-using-a-return-statement-that-returns-nothing
http://stackoverflow.com/questions/22134753/return-statement-in-javascript