JS Array in VAR

Question

Hey,
I want to count the length of an array with the help of a for loop.
How could I do that?
I need the VAR total to have the Value 20. Counted from myArr.
Thank you so much!
// The Code i tried
var myArr = [ 2, 3, 4, 5, 6];

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

Answer 1

Dear Deniz Lier,

You can try this one:

//js
const myArr = [2,3,4,5,6];
let total = 0;
for(let i = 0; i < myArr.length; i++) {
total += myArr[i];
}
console.log(total);

In this case using the "for loop", you are able to get the array items one by one, and add them to the total; after job done, you will console the result!
In other words, this happens:

array defined,
total is 0;
loop starts:
total = total + 2, // 0 + 2 = 2,
total = total + 3, // 2 + 3 = 5,
total = total + 4, // 5 + 4 = 9,
total = total + 5, // 9 + 5 = 14,
total = total + 6, // 14 + 6 = 20;
loop finished and total = 20
console.log(total); // consoles 20

The other easier way is using the "for of loop", which exactly does the same job:

//js
const myArr = [2,3,4,5,6];
let total = 0;
for(let sum of myArr) {
total += sum;
}
console.log(total);

Hope it worked! Any questions? I'm here to answer!

Answer 2

Welcome Deniz Lier,
It's allways nice to help each other, and make programing easier, better, and nicer!
As I see you like to learn, and like to find newer ways! There are several ways to get array values using different kind of loops. Here are two others:

//1st way
const arr = [2,3,4];
let total = 0;
for(let sum in arr) {
total += arr[sum];
}
console.log(total) //logs 9;

//2nd way
const arr = [2,3,4];
let total = 0;
arr.forEach(sum => {
total += sum;
});
console.log(total); //logs 9 in the js console

But the best way is "for of"; the way that I allways recommend.

Hope it helped you to understand arrays and loops better!
Have a good day!

Answer 3

just increment the variable

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

Answer 4

Radin Masiha thank you so much for this detailed answer!!! This was exactly what I needed. Also thank you for showing me such a better method for this

Answer 5

Yo should increment "total" in the loop and print the value of total outside of the loop. Here,

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

var total = 0;
for (var i = 0; i < myArr.length; i++){
total++
//console.log(total)
}

console.log(total)

I hope, it helps. Happy coding!

Answer 6

mesarthim Toni Isotalo thank you for the fast answer
If I do total++ and do the log outside of the loop it just shows me "5". I need to take all values and calculate them with each other that the total value is 20 = 6+5+4+3+2

Answer 7

Radin Masiha thank you so much I really appreciate your hard effort to help me code better!

Answer 8

Answer