Random String Generator Javascript - While Loop

Question

Trying to create a random letter generator with a "while" loop. It's return one value into the randomString and then quits the loop.

var alpha = "abcdefghijklmnopqrstuvwxyz";

var randomString = "";

while (randomString.length < 6) {
  console.log(randomString += alpha.charAt(Math.floor(Math.random() * alpha.length)));

  randomString++;
}

Returns one value from alpha string to randomString and then quits the loop instead of going on for 4 more loops - condition set at (randomString.length < 6).

Idk what randomString++ is going to do on a string - but that might be an issue. (It returns NaN) — tymeJV
– tymeJV, Commented Nov 3, 2016 at 19:30
why do you use the randomString++ function? This sets for adding a number on top of it's older value. you can delete this line — Mart
– Mart, Commented Nov 3, 2016 at 19:31

TimoStaudinger · Accepted Answer · 2016-11-03 19:32:10Z

2

Incrementing a string results in NaN, which doesn't have a length property, so the loop ends after one iteration.

Don't increment your randomString:

  var alpha = "abcdefghijklmnopqrstuvwxyz";

  var randomString = "";

  while (randomString.length < 6) {
    console.log(randomString += alpha.charAt(Math.floor(Math.random() * alpha.length)));
  }

answered Nov 3, 2016 at 19:32

TimoStaudinger

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Comments

Dmitry S. · Accepted Answer · 2021-08-15 16:23:28Z

0

create a variable and set is an empty string. Then, create a while loop that will continually add new random letters to this string, as long as the string length is less than 6 or any length you choose. += operator to add a new letter to the end of the string.

var alphabet = "abcdefghijklmnopqrstuvwxyz";
var randomString = "" // first, create an empty string

while (randomString.length < 6) {
    console.log(randomString += alphabet[Math.floor(Math.random() * alphabet.length)]);
    randomString++;
}

edited Aug 15, 2021 at 16:23

Dmitry S.

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answered Aug 15, 2021 at 11:57

Ibrahim Abiodun Bakare

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