10 examples of 'generate random characters in javascript' in JavaScript

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function generate(chars) {
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  let astral = [], re = ""
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  for (let i = 0, at = 0x10000; i < chars.length; i++) {
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    let from = chars[i], to = from
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    while (i < chars.length - 1 && chars[i + 1] === to + 1) {i++; to++}
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    if (to <= 0xffff) {
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      if (from === to) re += esc(from)
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      else if (from + 1 === to) re += esc(from) + esc(to)
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      else re += esc(from) + "-" + esc(to)
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    } else {
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      astral.push(from - at, to - from)
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      at = to
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    }
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  }
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  return {nonASCII: re, astral: astral}
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}

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export function getRandomChar(): string {
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  let n = Math.ceil(Math.random() * 100)
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  if (n <= 40) return String.fromCharCode(Math.floor(Math.random() * 26) + 65) // Majuscule
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  if (n <= 80) return String.fromCharCode(Math.floor(Math.random() * 26) + 97) // Minuscule
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  return String.fromCharCode(Math.floor(Math.random() * 10) + 48) // Numero
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}

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function getRandomChar(){
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  var randKey = round(random(65, 90));
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  char = String.fromCharCode(randKey);
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  char = char.toUpperCase();
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  return char;
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}

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function getRandomString(length, chars) {
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    var string = '';
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    for (var i = length; i > 0; --i) string += chars[Math.floor(Math.random() * chars.length)];
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    return string;
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}

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export default function generateString(length = 10) {
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	let key = "";
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	for (let i = 0; i < length; i++) {
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		key += getRandomChar();
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	}
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	return key + checksum(key);
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}

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function randomString(length, chars) {
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    var mask = "";
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    if (chars.indexOf("a") > -1) mask += "abcdefghijklmnopqrstuvwxyz";
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    if (chars.indexOf("A") > -1) mask += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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    if (chars.indexOf("#") > -1) mask += "0123456789";
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    if (chars.indexOf("!") > -1) mask += '~`!@#$%^&*()_+-={}[]:";\"<>?,./|\\';
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    var result = "";
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    for (var i = length; i > 0; --i) {
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        result += mask[Math.floor(Math.random() * mask.length)]
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    }
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    return result;
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}

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function randomString() {
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  const length = (Math.floor(Math.random() * 25) + 10);
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  let str = '';
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  for (let i = 0; i < length; i += 1) {
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      str += String.fromCharCode(Math.floor(Math.random() * 255))
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  }
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  return str;
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}

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public static stringRandom(chars: number): string{
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    let text = "";
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    let possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
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    for( let i = 0; i < chars; i++ )
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        text += possible.charAt(Math.floor(Math.random() * possible.length));
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    return text;
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}

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function randomChar() {
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  return CHARS[randomNumber(0, CHARS.length - 1)];
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}

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generateCode(length) {
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  for (var i = 0; i < length; i++) {
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    this.code += String.fromCharCode(Math.floor(Math.random() * 255));
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  }
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}