javascript function returns unexpected undefined

Question

I must have missed something stupid but why is sumArray returning undefined ???

<script>

    function sumArray(arr, n, sum){
        if(n == 0){
            console.log( arr[0] + sum ); // log shows 15 as expected
            return  arr[0] + sum;        // the function would return undefined
        }else{
            sum = sum + arr[n-1];
            sumArray(arr, n-1, sum); 
        }
    }

    var arr1 = [0,1,2,3,4,5];
    var result = sumArray(arr1, arr1.length, 0)

    console.log(result); // returns Undefined !!!

</script>

Shit looks like I didn't sleep weel after all ! Thanks a lot ! — Arno 2501
– Arno 2501, Commented Oct 8, 2013 at 8:06

Sudhir Bastakoti · Accepted Answer · 2013-10-08 08:02:33Z

6

change:

else{
    sum = sum + arr[n-1];
    sumArray(arr, n-1, sum); 
}

to

else{
  sum = sum + arr[n-1];
  return sumArray(arr, n-1, sum); //return the function
}

answered Oct 8, 2013 at 8:02

Sudhir Bastakoti

100k15 gold badges163 silver badges169 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

javascript function returns unexpected undefined

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related