What's iteration

Question

I usually see it

Answer 1

Please, detail your doubt. What would you like to understand?

You can easily find iteration definition in Google.

Being simple, iteration is what happen when your data "talk" to each other.

Answer 2

What data

Answer 3

Thats like.. you are going through every element in array or string or any iterable object.

For example, you have a list of numbers (2,5,7,9,15) and you want to do smth with them. So.. you can double them. Lets do it:

//an array of numbers
let nums = [2,5,7,9,15]
/*
Here we doing a loop and amount of iterations depends of "nums" array length. I hope you know about loops and arrays. Then we choose every number of our array with its index (as you can see, index we got from our "i" in the loop)
What's going on with "i" variable meanwhile? Depends of third part of "for" loop syntax. In most cases its growing by one. And what we have? Length of our array equals 5. First value of "i" equals 0. Every iteration it grows up by one. If we'll output it in our loop, we'll have:

0
1
2
3
4
5

*/
for (let i = 0; i < nums.length; i++) {
nums[i] *= 2
}

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