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Add step2-01 final folder with solutions
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‎index.html‎

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<div class="Tile-link">
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TypeScript Basics
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<div class="Tile-links">
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<a target="_blank" href="./step2-01/demo/">demo</a> | <a target="_blank" href="./step2-01/exercise/">exercise</a>
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<a target="_blank" href="./step2-01/demo/">demo</a> | <a target="_blank" href="./step2-01/exercise/">exercise</a> | <a target="_blank" href="./step2-01/final/">final</a>
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</div>
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</div>
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</li>

‎step2-01/demo/README.md‎

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# Step 2.1 - Introduction to TypeScript (Demo)
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[Lessons](../../) | [Exercise](../exercise/)
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[Lessons](../../) | [Exercise](../exercise/) | [Final](../final/)
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In this step, we'll cover enough TypeScript concepts to be productive with the React & Redux frameworks.
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‎step2-01/exercise/README.md‎

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# Step 2.1 - Introduction to TypeScript (Exercise)
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[Lessons](../../) | [Demo](../demo/)
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[Lessons](../../) | [Demo](../demo/) | [Final](../final/)
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If you don't already have the app running, start it by running `npm start` from the root of the `frontend-bootcamp` folder.
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‎step2-01/exercise/src/index.ts‎

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// TODO: import the fib(n) function and the constant from './fibonacci.ts'
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// import {fib}, FibConst from ...
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// import FibConst, {fib} from ...
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// TODO: import Stack from './stack.ts'
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// TODO: import Stack from ...
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// Do the exercises here, outputting results using console.log()
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console.log('hello world');
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async function run() {
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// TODO: call makePromise() using await syntax and log the results
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// TODO: call your new async function
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}
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run();
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// Make this file a module so its code doesn't go in the global scope
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export { };
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export {};

‎step2-01/final/README.md‎

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# Step 2.1 - Introduction to TypeScript (Final)
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[Lessons](../../) | [Demo](../demo/) | [Exercise](../exercise/)
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Look at the src folder for exercise solutions.

‎step2-01/final/index.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<link rel="stylesheet" href="../../assets/step.css" />
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</head>
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<body class="ms-Fabric">
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<div id="markdownReadme" class="exercise" data-src="./README.md"></div>
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<div id="app">
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Nothing to show here; just look at your console window for output. Hit F12 (<code>cmd+option+I</code> on Mac) to open the console
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window.
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</div>
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<script src="../../assets/scripts.js"></script>
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</body>
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</html>

‎step2-01/final/src/fibonacci.ts‎

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export function fib(n: number) {
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return n <= 1 ? n : fib(n - 1) + fib(n - 2);
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}
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const FibConst: number = 3;
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export default FibConst;

‎step2-01/final/src/index.ts‎

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import FibConst, { fib } from './fibonacci';
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import { Stack } from './stack';
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console.log('hello world');
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// ---- Modules ----
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console.log('fib(FibConst) is:', fib(FibConst));
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// ---- Types and Interfaces ----
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type TrafficLight = 'red' | 'green' | 'yellow';
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const annoyingLight: TrafficLight = 'red';
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interface Car {
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wheels: number;
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color: string;
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make: string;
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model: string;
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}
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const myCar: Car = {
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wheels: 4,
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color: 'blue',
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make: 'Toyota',
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model: 'Camry'
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};
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// JSON.stringify makes a nice string representation of an object
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console.log('My car:', JSON.stringify(myCar));
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// ---- Generics ----
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const myStack = new Stack<number>();
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myStack.push(1);
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myStack.push(2);
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myStack.push(3);
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console.log('Number on top of the stack:', myStack.pop());
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// ---- Spread and Destructuring ----
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const obj1 = {
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first: 'who',
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second: 'what',
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third: 'dunno',
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left: 'why'
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};
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const obj2 = {
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center: 'because',
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pitcher: 'tomorrow',
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catcher: 'today'
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};
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const megaObj = { ...obj1, ...obj2 };
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const { first, second, catcher } = megaObj;
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console.log('First:', first);
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console.log('Second:', second);
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console.log('Catcher:', catcher);
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// ---- Async / Await ----
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function makePromise(): Promise<number> {
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return Promise.resolve(5);
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}
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async function getGreeting(name: string): Promise<string> {
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return 'hello ' + name;
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}
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async function run() {
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const result = await makePromise();
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console.log('makePromise returned:', result);
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const greeting = await getGreeting('Ken');
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console.log('greeting:', greeting);
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}
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run();
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// Make this file a module so its code doesn't go in the global scope
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export {};

‎step2-01/final/src/stack.ts‎

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export class Stack<T> {
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private _store: T[];
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constructor() {
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this._store = [];
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}
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push(elem: T): void {
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this._store.push(elem);
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}
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pop(): T {
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return this._store.pop();
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}
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}

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