script.js

function generatePassword(length, includeLowercase, includeNumbers, includeSymbols, includeUppercase){
    const lowercaseChars = "abscdefghijklopqrstuvwxyz";
    const uppercaseChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    const numberChars = "0123456789"
    const symbolChars = "@._&";
    let allowedChars = " ";
    let password = "";
    allowedChars += includeLowercase ? lowercaseChars: ""; 
    allowedChars += includeUppercase ? uppercaseChars: ""; 
    allowedChars += includeNumbers ? numberChars:"";
    allowedChars += includeSymbols ? symbolChars:"";
    console.log(allowedChars);
    if(length <= 0){
        return `(password length must be at least 1)`;
    }
    if(allowedChars.length === 0){
        return `(At least 1 char needs to be selected)`
    }
    for(let i = 0; i<length; i++){
        const randomIndex = Math.floor(Math.random() * allowedChars.length);
        password += allowedChars[randomIndex];
    }
    
    return password;
}


const passwordLength = 12;
const includeLowercase = true;
const includeUppercase = true;
const includeNumbers = true;
const includeSymbols = true;

const password = generatePassword(passwordLength, includeLowercase, 
    includeNumbers,
    includeUppercase,
    includeSymbols);

console.log(`Generated Password:${password}`);