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I want to generate random a - z letter(1 letter) in JavaScript without typing all letters. But I don't know how. I want to use Math.floor(Math.random * ?). But I don't know what is ?. I want to use JavaScript in this HTML code:
<!DOCTYPE html>
<html>
<head>
<title>AZ Generator</title>
</head>
<body>
<script src="az-generator.js"></script>
<button onclick="az()">Generate</button>
<p id="p"></p>
</body>
</html>
270
asked Nov 01 '25 09:11
There're 2 things you need:
String.fromCharCode()So, the solution could be as simple as that:
const randomLetter = () => String.fromCharCode(0|Math.random()*26+97)
console.log(randomLetter())If you need to extend that to get random string of desired length (say, 15 chars long), you may go like that:
const randomLetter = () => String.fromCharCode(0|Math.random()*26+97)
const randomLineOfLetters = (lineSize) => () => Array(lineSize)
.fill()
.map(randomLetter)
.join('')
const randomLineOf15Letters = randomLineOfLetters(15)
console.log(randomLineOf15Letters())Since you haven't mentioned case sensitivity, you may pick the starting char code from either [a-z] or [A-Z] ranges, or randomly apply .toUpperCase():
const randomLetterRandomCase = () => {
const aCharCode = 97
const capitalACharCode = 65
const alphabetSize = 26
const startChar = Math.random() < 0.5
? capitalACharCode
: aCharCode
return String
.fromCharCode(0|Math.random()*alphabetSize+startChar)
}
const randomlyCasedRandomLetter = () => {
const aCharCode = 97
const alphabetSize = 26
const isUpperCase = Math.random() < 0.5
const randomLetter = String
.fromCharCode(0|Math.random()*alphabetSize+aCharCode)
return isUpperCase
? randomLetter.toUpperCase()
: randomLetter
}
const randomLineOfLetters = (lineSize, letterPicker) => Array(lineSize)
.fill()
.map(letterPicker)
.join('')
console.log(randomLineOfLetters(15, randomLetterRandomCase))
console.log(randomLineOfLetters(15, randomLetterRandomCase))If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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