Javascript function parameter in a Template Literal string issue

Question

Im learning javascript using webtools of essential webbrowsers (toolset with F12). here is a show up example

function sayHello(n){
document.writeln($`Hello {n}`);
}
sayHello("Andy Anderson");
//undefined appears as a result.

I expected result as "Hello Andy Anderson" but I got an undefined

Answer 1

The dollar sign comes before the opening curly brace:

document.writeln(`Hello ${n}`);

function sayHello(n){
    document.writeln(`Hello ${n}`);
}
sayHello("Andy Anderson");