Oletem
9/28/2017 - 9:05 PM

Iterate Through an Array with a For Loop

A common task in JavaScript is to iterate through the contents of an array. One way to do that is with a for loop. This code will output each element of the array arr to the console:

var arr = [10,9,8,7,6]; for (var i=0; i < arr.length; i++) { console.log(arr[i]); } Remember that Arrays have zero-based numbering, which means the last index of the array is length - 1. Our condition for this loop is i < arr.length, which stops when i is at length - 1.

Instructions Declare and initialize a variable total to 0. Use a for loop to add the value of each element of the myArr array to total.


// Example
var ourArr = [ 9, 10, 11, 12];
var ourTotal = 0;

for (var i = 0; i < ourArr.length; i++) {
  ourTotal += ourArr[i];
}

// Setup
var myArr = [ 2, 3, 4, 5, 6];

// Only change code below this line

var total = 0;

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