Please complete all exercises inside the exercise/src folder unless otherwise specified in the exercises below. First, open up Step2-01 exercise page to see the results while you're implementing things.

Modules

Open up file called index.ts in VS Code
Create another module file called fibonacci.ts
Inside the file from (step 2), write a function called fib(n) that takes in a number and returns a the n-th Fibonacci number - be sure the specify the type of n

HINT: fib(n) = fib(n - 1) + fib(n - 2); fib(n <= 1) = n;

Export fib(n) as a named export
Export another const variable as a default export
Import both the modules created in steps (4) and (5) and use the provided log() function to log it onto the page.

Types, Interfaces, and Classes

Create inside index.ts:

a type alias for string union type describing the states of Red-Green-Yellow traffic light
a class hierarchy of your favorite metaphor (e.g. family, autombiles, animals)
describe an object type with an interface

Generic

Inside index.ts, create a generic class for a Stack<T> complete with a typed pop() and push() methods

Hint: the Javascript array already has push() and pop() implemented for you. That can be your backing store.

Be sure to use the provided log() to show the functionality of Stack<T>

Spread and Destructure

Note the following code in index.ts:

const obj1 = {
  first: 'who',
  second: 'what',
  third: 'dunno',
  left: 'why'
};

const obj2 = {
  center: 'because',
  pitcher: 'tomorrow',
  catcher: 'today'
};

Now create a one-liner using the spread syntax {...x, ...y} to create a new variable that combines these two objects.
Using the destructuring syntax to retrieve the values for {first, second, catcher} from this new object created in step (2).

Async / Await

Note the following code in index.ts:

function makePromise() {
  return Promise.resolve(5);
}

call makePromise() with the await syntax and log the results using the provided log() function
create a new function that uses the async keyword to create an async function. Make an await call to makePromise() and return the results