How to set a default value for Javascript parameters

Question

Good afternoon!

I won’t go into a system context, not to stretch, but let’s assume the code below:

let meuNome = "Lucas"
function setNome(meuNome) {
    return meuNome;
}

As you can see, I want my variable to go straight into the parameter, only this way it won’t work for obvious reasons. How should I treat this case then?

Thank you!

EDIT

How to set a default value for Javascript parameters