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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops For Loops

Posted by Kirby Abogaa
Kirby Abogaa
3,058 Points

Undefined

Can anyone tell what makes the code undefined? 

<script>
var randomNumber = getRandomNumber(2);

function getRandomNumber(upper) {
  Math.floor( Math.random() * upper ) + 1 ;
}

console.log(randomNumber);
</script>

2 Answers

Grace Kelly
Grace Kelly
33,990 Points

Hi Kirby the code above gives you an undefined value because the function does not return a value, we return a value by doing the following:

function getRandomNumber(upper) {
 num = Math.floor( Math.random() * upper ) + 1; //assign the random value to num variable
  return num; //return the variable

}

or by simply doing 

function getRandomNumber(upper) {
 return Math.floor( Math.random() * upper ) + 1; //return the random number
}

By doing this, when you log out the randomNumber variable it will show you a number

Hope that helps!!

Kirby Abogaa
Kirby Abogaa
3,058 Points
Kirby Abogaa
Kirby Abogaa
3,058 Points

Thanks Grace!

I actually just realized the solution and was about to post it here. But hey, you did it already!

Cheers!

Grace Kelly
Grace Kelly
33,990 Points

no worries glad you figured it out!! :)