const user = {
  name: 'Alex',
  score: 42,
  [Symbol.toPrimitive](hint) {
    // JavaScript tells us what type it wants with the 'hint' parameter
    // hint can be: 'number', 'string', or 'default'

    switch (hint) {
      case 'number':
        return this.score;    // When JavaScript needs a number (like +user)

      case 'string':
        return this.name;     // When JavaScript needs a string (like `${user}`)

      default:
        return `${this.name} (${this.score})`; // For other operations (like user + '')
    }
  }
};

// Examples of how JavaScript uses these conversions:
console.log(+user);        // + operator wants a number, gets 42
console.log(`${user}`);    // Template literal wants a string, gets "Alex"
console.log(user + '');    // + with string uses default, gets "Alex (42)"

countryToAlpha2("United States"); // returns "US"
countryToAlpha2("United States of America"); // returns "US"
countryToAlpha2("America"); // returns "US"