Get a random string.

getRandomString.js

/**
 * Get a random string.
 * @author mebtte<mebtte@gamil.com>
 * @param {String} [length] The length of string, detault `10`.
 * @return {String} A random string.
 */
function getRandomString(length = 10) {
  const randomChars = [
    "0",
    "1",
    "2",
    "3",
    "4",
    "5",
    "6",
    "7",
    "8",
    "9",
    "a",
    "b",
    "c",
    "d",
    "e",
    "f",
    "g",
    "h",
    "i",
    "j",
    "k",
    "l",
    "m",
    "n",
    "o",
    "p",
    "q",
    "r",
    "s",
    "t",
    "u",
    "v",
    "w",
    "x",
    "y",
    "z"
  ];
  const randomCharLength = randomChars.length;
  let string = "";
  for (let i = 0; i < length; i += 1) {
    string += randomChars[Math.floor(randomCharLength * Math.random())];
  }
  return string;
}