Generate random code of letters and numbers.js

let generateCode = (givenOptions = {}) => {
    const {pool, length} = {
        ...{length: 3, pool: 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'.split('')},
        ...givenOptions
    };
    let code = '';
    while (code.length < length) {
        code += pool[Math.floor(Math.random() * pool.length)];
    }
    return code;
}