JS array of basic grammar --- --- 5 Case exercises, one after another record

Exercise 1: Find all of the elements in the array and

    var arr1 = [10, 20, 30, 40, 50];
    var sum = 0;
    for (var i = 0; i < arr1.length; i++) {
      sum += arr1[i];
    }
    console.log(sum);

 

Exercise 2: averaging all the elements of the array

    var arr2 = [1, 2, 3, 4, 5];
    var sum2 = 0;
    for (var i = 0; i < arr2.length; i++) {
      sum2 += arr2[i];
    }
    console.log(sum2 / arr2.length);