Basic JavaScript - Iterate Through an Array with a For Loop

JavaScript
1

Tell us what’s happening:

My answer is working, but at first I did total = undefined, after adding, it gave me NaN, from my understanding is we can give undefined to something which is not defined yet? so total is not defined yet, so why is NaN when every loop add to it?

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Challenge Information:

Basic JavaScript - Iterate Through an Array with a For Loop

2

Hello!

Please do not post the full working code to the forum?

The forum is attempting to lower the amount of spoilers for learners.

Here is a link found in fCC News category that I think can answer your question.

3

Taking as an example the first iteration (i == 0). The myArr[i] is added to the previous value of total. What would be then the result of adding undefined and myArr[0]?

console.log(undefined + 2);  // NaN
4

I have removed my code, sorry for posting the solution.

1 Like
5

Oh now I got it, if it was total = 2, it wouldn’t be NaN but as it is undefined, adding any value to undefined will be NaN coz of type coericin?

6

In case of numbers - correct.

7

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