How to calculate the sum of array elements?

  • 0
    We need to write a function that takes an array of numbers and returns their sum.

    Here's my bad code:
    const arr = [20, 40, 77, 53];
    const sum = 0;
    function count() {
        for (i = 0; i < arr.length; i++) {
            sum += arr[i];
          
        }
    }
    count()
    JavaScript Felicity Thomas, Nov 22, 2019

  • 4 Answers
  • 0
    Strange, so many answers and not a single redux ...

    const count = (arr) => arr.reduce((acc, num) => acc + num, 0);




    And for some reason, nobody was embarrassed that the author assigns a new value to the constant.
    Mason Page

  • 0
    Also as an option:



    const arr = [20, 40, 77, 53];

    function count(arr) {
    let sum = 0;
    arr.forEach(function(item){
    sum += item
    })
    return sum;
    }
    count(arr);
    Anonymous

  • 0
    1.return sum - skipped)

    2.and instead of const you need let (hint WbICHA )
    Anonymous

  • 0
    const arr = [20, 40, 77, 53];
    const sum = 0;
    function count() {
    for (i = 0; i < arr.length; i++) {
    sum += arr[i];
    }
    return sum;
    }
    console.log(count());
    Anonymous

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