splitting 2.1 and 2.2 readme's

2026-01-26 14:56:42 +08:00 · 2019-02-28 21:45:48 -08:00
parent 0a7cac4eb3
commit b19973652a
10 changed files with 120 additions and 109 deletions
--- a/step2-01/exercise/README.md
+++ b/step2-01/exercise/README.md
@@ -0,0 +1,78 @@
+# Step 2.1: Introduction to TypeScript (Exercise)
+
+[Lessons](../) | [Exercise](./exercise/) | [Demo](./demo/)
+
+# Exercise
+
+If you don't already have the app running, start it by running `npm start` from the root of the `frontend-bootcamp` folder.
+
+Exercises will be completed under this step's `exercise/src` folder unless otherwise noted. You'll also want to open the [Step2-01 exercise page](http://localhost:8080/step2-01/exercise/) to see the results as you work.
+
+## Modules
+
+1. Open the file `exercise/src/fibonacci.ts` in VS Code
+
+2. Inside this file, write a function called `fib(n)` that takes in a number and returns the `n`-th Fibonacci number (be sure the specify the type of `n`).
+
+> HINT: `function fib(n: number) { return n <= 1 ? n : fib(n - 1) + fib(n - 2); }`
+
+3. Export `fib(n)` as a **named export**
+
+4. Export a const variable `FibConst` as a **default export**
+
+5. Inside `index.ts` in the same folder, import both `fib` and `FibConst`, and use the built-in `console.log()` function to log the result of `fib(FibConst)`.
+
+## Types and Interfaces
+
+Inside `exercise/src/index.ts`:
+
+1. Add a type alias for string union type describing the states of Red-Green-Yellow traffic light: `type TrafficLight = ???`
+
+2. Describe a type of car with an interface: `interface Car { ... }` complete with `wheels`, `color`, `make`, `model`
+
+3. Create a valid car instance and log it using `console.log()`: `const myCar: Car = { ??? }`;
+
+## Generics
+
+Inside `exercise/src/stack.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.
+
+In `exercise/src/index.ts`, create a `Stack<number>` and use `console.log()` to demonstrate its functionality.
+
+## Spread and Destructuring
+
+1. Note the following code in index.ts:
+
+```ts
+const obj1 = {
+  first: 'who',
+  second: 'what',
+  third: 'dunno',
+  left: 'why'
+};
+
+const obj2 = {
+  center: 'because',
+  pitcher: 'tomorrow',
+  catcher: 'today'
+};
+```
+
+2. Now create a one-liner using the spread syntax `{...x, ...y}` to create a new variable `megaObj` that combines these two objects.
+
+3. Use the destructuring syntax to retrieve the values for `{first, second, catcher}` from `megaObj`.
+
+## Async / Await
+
+Note the following code in index.ts:
+
+```ts
+function makePromise() {
+  return Promise.resolve(5);
+}
+```
+
+1. Call `makePromise()` with the `await` syntax and log the results.
+
+2. Create a new function that uses the `async` keyword. Inside the function, make an `await` call to `makePromise()` and return the results.
--- a/step2-01/exercise/index.html
+++ b/step2-01/exercise/index.html
@@ -4,9 +4,10 @@
    <link rel="stylesheet" href="../../assets/step.css" />
  </head>
  <body class="ms-Fabric">
-    <div id="markdownReadme"></div>
+    <div id="markdownReadme" class="exercise" data-src="./README.md"></div>
    <div id="app">
-      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 window.
+      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
+      window.
    </div>
    <script src="../../assets/scripts.js"></script>
  </body>