Can't understant the array[index]

Question

Why does this code print 20 and not 18 ?

var myArr = [ 2, 3, 4, 5, 6];
var total = 0;

for (var i = 0; i < myArr.length; i++) {
total += myArr[i];

}
console.log(total); //Prints 20, why ?

/*Won't i become equal to 1, and the 1 index is "3" because javaScript arrays start counting from 0 */

Answer 1

The loop goes over the indexes 0 to 4 and adds every item to total.

2+3+4+5+6 == 20.