Generate Random String (JavaScript)

example.js

const numbers = '0123456789';
const specials = '`-=[]\\;\',./~!@#$%^&*()_+{}|:"<>?';
const charsLower = 'abcdefghijklmnopqrstuvwxyz';
const charsUpper = charsLower.toUpperCase();
const alphabet = charsLower + charsUpper;
const alphaNumeric = numbers + alphabet;
const all = alphaNumeric + specials;

const random = {
    numbers,
    specials,
    charsLower,
    charsUpper,
    alphabet,
    alphaNumeric,
    all,
};

for (const charset in random) {
    const randomString = generateRandomString(8, random[charset]);

    console.log(charset, ':', randomString);
}

javascript.js

/**
 * Generate random integer
 *
 * @param {number} min Specifies the lowest number to return
 * @param {number} max Specifies the highest number to return
 *
 * @returns {number} A random integer between min and max
 */
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

/**
 * Generate random string
 *
 * @param {number} length     Specifies the length of the random string
 * @param {string} characters define the characters for the string
 *
 * @returns {string}
 */
function generateRandomString(length, characters) {
    let result = '';

    for (let i = 0; i < length; i++) {
        const randIndex = getRandomInt(0, characters.length - 1);
        const randChar = characters[randIndex];

        result += randChar;
    }

    return result;
}