How do you generate a random letter from the alphabet?

In this article, we'll show you how to do that using plain and simple JavaScript.

In your code, you'll need two things:

  1. A string that contains each letter of the alphabet you can randomly select from.
  2. An expression that randomly selects one of the characters from the string of alphabet letters.

Here is what the code looks like:

    
      const alphabet = "abcdefghijklmnopqrstuvwxyz"

      const randomCharacter = alphabet[Math.floor(Math.random() * alphabet.length)]
    
  

The alphabet variable holds a string containing all the letters in the alphabet. And the alphabet[Math.floor(Math.random() * alphabet.length)] expression selects a random character from the alphabet string.

If you log the randomCharacter variable, you'll get a random letter from the alphabet.

Here's what this method would look like in a function:

    
      function generateRandomLetter() {
        const alphabet = "abcdefghijklmnopqrstuvwxyz"

        return alphabet[Math.floor(Math.random() * alphabet.length)]
      }

      console.log(generateRandomLetter()) // "h"
      console.log(generateRandomLetter()) // "t"
      console.log(generateRandomLetter()) // "a"
      console.log(generateRandomLetter()) // "l"
      console.log(generateRandomLetter()) // "v"
      console.log(generateRandomLetter()) // "q"
    
  

When you run the generateRandomLetter() function, a random letter will be returned.

You can also modify the function to include uppercase letters:

    
      function generateRandomLetter() {
        const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

        return alphabet[Math.floor(Math.random() * alphabet.length)]
      }

      console.log(generateRandomLetter()) // "o"
      console.log(generateRandomLetter()) // "X"
      console.log(generateRandomLetter()) // "L"
      console.log(generateRandomLetter()) // "J"
      console.log(generateRandomLetter()) // "c"
      console.log(generateRandomLetter()) // "A"
    
  

Notice that the only change we made was to the letters inside the alphabet string. And as you can see, the function will return both lowercase and uppercase letters.

This method could also be used for other alphabets in other languages.

Thanks for reading and happy coding!