Basic JavaScript - Replace Loops using Recursion

JavaScript
1

Hello, this is my code so far. When I run the test there are x’s for sum([1], 0) should equal 0 .
and for sum( [2, 3, 4, 5], 3) should equal 9.
How do I correct my code to complete this task.

Your code so far

function sum(arr, n) {
  // Only change code below this line
if (n <= 0) {
  return 1;
} else {
  return sum(arr, n - 1) * arr[n - 1];
}

  // Only change code above this line
}

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Challenge: Basic JavaScript - Replace Loops using Recursion

Link to the challenge:

2

You can add in console.log() lines for debugging:

console.log(arr[n-1])

Add this as test case at bottom:

console.log(sum([2, 3, 4, 5], 3))

Then,

  1. why use * when you are looking for sum.
  2. why return 1 when n <= 0 ?

return sum(arr, n - 1) * arr[n - 1];

if (n <= 0) {
  return 1;
3

gotchu. I figured it out added the + and changed return 1 to return 0. thanks

4

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