Password creator not outlogging the expected output

Question

I am currently trying to make a password creator, just to get some pratice. However I have run into a problem. When I try to console.log my password, it outputs undefined, no error messeages. I think it has something to do with my for loop in my generatePassword function, however I don't see the problem myself.

JavaScript

const randomFunc = {
    lower: getRandomLower,
    upper: getRandomUpper,
    number: getRandomNumber,
    symbol: getRandomSymbol
}

const passwLength = 20;

function generatePassword() {
    for(let i = 0; i < passwLength;) {
        let password = randomFunc.lower; randomFunc.upper; randomFunc.number; randomFunc.symbol;
        i++
        console.log(password)
    }
}

function getRandomLower() {
    return String.fromCharCode(Math.floor(Math.random() * 26) + 97);
}

function getRandomUpper() {
    return String.fromCharCode(Math.floor(Math.random() * 26) + 65);
}

function getRandomNumber() {
    return String.fromCharCode(Math.floor(Math.random() * 10) + 48);
}

function getRandomSymbol() {
    const symbols = '!"#¤%&/()=@£$€{[]}|*^~+-,.;:<>|§';
    return symbols[Math.floor(Math.random() * symbols.length)];
}