Is it possible to get a random letter from a string element inside an array?

JavaScript
1

Say you have the following array:

let characters = ['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 
'abcdefghijklmnopqrstuvwxyz', '1234567890', '!@#$%^&*()'];

Would it be possible to get a random string, from any index? Say I wanted at least 1 string value from index 0. Could I loop through the array, and grab the random letter from index 0? What would that look like?

2

You can create a random index with Math.floor(Math.random()*str.length)

Math.random creates a random number between 0(inclusive) and 1(exclusive), multiplying by str.length, in your example 26, gives a random number between 0(inclusive) and 26(exlusive). Math.floor then rounds that number down to the closest integer. so you’ll get a random integer between 0(inclusive) and 25(inclusive).

I assume this is the main part you are having problems with?

3

That’s exactly what is the problem. So far I have:

Math.floor(Math.Random() * characters[0].toString().length);

But all that does is return numbers.

4

Yeah, math.floor returns a number. You now need to use that number to retrieve a character from the characters[0] string. Also, it’s already a string, so you don’t need to call toString()

let index = Math.floor(Math.random() * characters[0].length);
let randomCapitalLetter = characters[0][index];
5

Did you get a TypeError for that?

6

fixed it, I accidentally capitalised random

7

I didn’t see that finer detail, sorry. But thank you for your help!

1 Like
8

mind posting the answere for other people?

9 
let characters = ['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 
'abcdefghijklmnopqrstuvwxyz', '1234567890', '!@#$%^&*()'];

const getRandomCapital = () => characters[0][Math.floor(Math.random()*characters[0].length)]

//or

function getRandomCapital(){
    let index = Math.floor(Math.random() * characters[0].length);
    return (characters[0][index]);
}
1 Like