Function in if

let phrase = "Hello";

if (true) {
  let user = "John";

  function sayHi() {
    alert(`${phrase}, ${user}`);
  }
}

sayHi();

The result is an error.

The function sayHi is declared inside the if, so it only lives inside it. There is no sayHi outside.

When I execute the code I don't get any error unless in strict mode, I think it can be a good idea to remind others that in order to see the error we need to add `'use strict';' at the top of our code