You could use Setter

const gotolocation = {
  set href(url) {
    url += "?search=stackoverflow";
    window.location = url;
  }
};

gotolocation.href = "https://google.com";

but in such case gotolocation would be an Object with a Setter function bound to the href property, not a function per-se.

If your question was: "How to use this function"
than the answer is simple: your function accepts one argument, so pass one:

gotolocation("https://google.com");

You can create an object with function, like class in OOP;

const location = {
   href: "https://facebook.com",
   goto: () => {
      let link = location.href + "?search=stackoverflow";
      window.location = link;
   }
}

location.href = "https://google.com";

location.goto();

you can pass a value to a function

gotolocation("https://google.com");