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id	title	challengeType	videoUrl	forumTopicId	dashedName
5675e877dbd60be8ad28edc6	Iterate Through an Array with a For Loop	1	https://scrimba.com/c/caeR3HB	18216	iterate-through-an-array-with-a-for-loop

--description--

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:

const arr = [10, 9, 8, 7, 6];

for (let i = 0; i < arr.length; i++) {
   console.log(arr[i]);
}

Remember that arrays have zero-based indexing, which means the last index of the array is length - 1. Our condition for this loop is i < arr.length, which stops the loop when i is equal to length. In this case the last iteration is i === 4 i.e. when i becomes equal to arr.length - 1 and outputs 6 to the console. Then i increases to 5, and the loop terminates because i < arr.length is false.

--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.

--hints--

total should be declared and initialized to 0.

assert(code.match(/(var|let|const)\s*?total\s*=\s*0.*?;?/));

total should equal 20.

assert(total === 20);

You should use a for loop to iterate through myArr.

assert(/for\s*\(/g.test(code) && /myArr\s*\[/g.test(code));

You should not attempt to directly assign the value 20 to total.

assert(!__helpers.removeWhiteSpace(code).match(/total[=+-]0*[1-9]+/gm));

--seed--

--after-user-code--

(function(){if(typeof total !== 'undefined') { return "total = " + total; } else { return "total is undefined";}})()

--seed-contents--

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

// Only change code below this line

--solutions--

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

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

1.9 KiB Raw Blame History