Simple Array Sum using javascript (single integer)

Question

Been finding the this sum difficult to solve:

Question: Given an array of integers, find the sum of its elements.

For example, if the array ar = [1,2.3],1+2+3=6 so return 6.

Function Description

Complete the simpleArraySum function in the editor below. It must return the sum of the array elements as an integer.

I have tried:

function simpleArraySum(ar) {
    var sum = 0;
    for (var i = 0; i <ar.length; i++) {
    sum += (ar);
    return sum;
    }
}

Output is: 01,2,3,4,10,11

It should be 31.

Help please

Does this answer your question? How to find the sum of an array of numbers — Ivar
– Ivar, Commented Jun 19, 2020 at 9:38
What is sum += (ar) supposed to do? sum is a number and ar an array. And why is return sum in the loop? — Andreas
– Andreas, Commented Jun 19, 2020 at 9:40
Two problems with your code: sum += (ar); tries to add the array ar to sum. You have to access the individual elements of the array instead (that's why you are using a loop). return sum; inside the loop will terminate the function (and therefore the loop) in the first iteration of the loop. Only return the sum after you have processed all array elements. — Felix Kling
– Felix Kling, Commented Jun 19, 2020 at 9:40

SENPAY98K · Accepted Answer · 2022-08-05 20:11:33Z

5

There are two problems in your code. You need to change

sum += (ar); to sum += (ar[i]);

so as to sum the element at that index and not the ar itself. Also return should be outside the loop and should actually be the return of the function. Otherwise, for..loop will just return after the first execution.

function simpleArraySum(ar) {
  var sum = 0;
  for (var i = 0; i < ar.length; i++) {
    if(typeof ar[i] == `number`) sum += ar[i];
  }
  return sum;
}

console.log(simpleArraySum([1, 2, 3, 4]))

edited Aug 5, 2022 at 20:11

SENPAY98K

54 bronze badges

answered Jun 19, 2020 at 9:44

ABGR

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1 Comment

Nina Scholz Over a year ago

why not omit parentese around the value of the array. it is superfluous and irritating, because it has no reason.

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