Challenge 1 — Solution

Task: Write a plain function introduce(role) that logs
`${this.name} works as a ${role}`. Create two different objects,
each with a name property, and use call() to invoke introduce with
each object as this, passing a different role string each time.

function introduce(role) {
    console.log(`${this.name} works as a ${role}`);
}

const alice = { name: "Alice" };
const bob = { name: "Bob" };

introduce.call(alice, "developer");
introduce.call(bob, "designer");


Expected output:

Alice works as a developer
Bob works as a designer


Notes:
- introduce is never attached to alice or bob as a method — call()
  is what supplies this for that one invocation, entirely separate
  from how the function was defined.
- The first argument to call() is always the value for this; any
  further arguments (here, role) are passed through to the function
  normally, in order.
- introduce itself has no idea in advance which object it will be
  called with — that's decided fresh at each call() invocation.