complete ts chapter 2

Author: jinnatul

.gitignore

@@ -0,0 +1 @@
+/node_modules

chapters/1/codes/1.3/app.ts

@@ -9,5 +9,4 @@ class myContainer {
 };
 
 let createObj = new myContainer("Hi Morol!");
-console.log(createObj);
 console.log(createObj.getData());

chapters/2/codes/2.1/app.ts

@@ -0,0 +1,21 @@
+/*
+
+If you find the arguments for type systems persuasive in general, then you'll be happy with TypeScript.
+It brings many of the advantages of type system (safety, readability, improved tooling) to the 
+JavaScript ecosystem. It also suffers from some of the drawbacks of type systems (added complexity 
+and incompleteness).
+
+*/
+
+function double(num: number): number {
+  return num * 5;
+}
+
+/*
+console.log(double('6')); 
+
+myTs.ts:5:20 - error TS2345: Argument of type '"6"' is not assignable 
+to parameter of type 'number'.
+*/
+
+console.log(double(6)); // 30

chapters/2/codes/2.2/app.ts

@@ -0,0 +1,13 @@
+// TypeScript enables editors to provide contextual documentation:
+
+'morol'.slice();
+
+/*
+
+slice(start?: number, end?: number): string
+The index to the beginning of the specified portion of stringObj.
+Returns a section of a string.
+
+*/
+
+// You'll never forget whether String.prototype.slice takes (start, stop) or (start, length) again!

chapters/2/codes/2.3/app.ts

@@ -0,0 +1,23 @@
+/*
+
+TypeScript allows editors to perform automated refactors which are aware of the rules 
+of the languages.
+
+*/
+
+let ans = 'morol';
+{
+  let ans = (num: number) => {
+    return 5 * num;
+  }
+
+  //console.log(ans); // [Function: ans_1]
+  console.log(ans(10)) // 50
+}
+
+console.log(ans); // morol
+
+/*
+Here, for instance, Visual Studio Code is able to rename references to the inner ans without 
+altering the outer ans. This would be difficult to do with a simple find/replace.
+*/

chapters/2/readme.md

@@ -2,6 +2,6 @@
 
 | **Topic** | **Code** |
 |:---------:|:--------:|
-| Section 2.1: Safety | [code-here](/chapters/2/codes/2.0/app.md) |
-| Section 2.2: Readability | [code-here](/chapters/2/codes/2.1/app.md) |
-| Section 2.3: Tooling | [code-here](/chapters/2/codes/2.2/app.md) |
+| Section 2.1: Safety | [code-here](/chapters/2/codes/2.1/app.ts) |
+| Section 2.2: Readability | [code-here](/chapters/2/codes/2.2/app.ts) |
+| Section 2.3: Tooling | [code-here](/chapters/2/codes/2.3/app.ts) |

myTs.ts

@@ -0,0 +1,25 @@
+{
+  "name": "type-script",
+  "version": "1.0.0",
+  "description": "| Chapter | Details | |:-------:|:-------:| | 1: Getting started with TypeScript | [Readme](/chapters/1/readme.md) | | 2: Why and when to use TypeScript | [Readme](/chapters/2/readme.md) | | 3: TypeScript Core Types | [Readme]() | | 4: Arrays | [Readme]() | | 5: Enums | [Readme]() | | 6: Functions | [Readme]() | | 7: Classes | [Readme]() | | 8: Class Decorator | [Readme]() | | 9: Interfaces | [Readme]() | | 10: Generics | [Readme]() | | 11: Strict null checks | [Readme]() | | 12: User-defined Type Guards | [Readme]() | | 13: TypeScript basic examples | [Readme]() | | 14: Importing external libraries | [Readme]() | | 15: Modules - exporting and importing | [Readme]() | | 16: Publish TypeScript definition files | [Readme]() | | 17: Using TypeScript with webpack | [Readme]() | | 18: Mixins | [Readme]() | | 19: How to use a JavaScript library without a type definition file | [Readme]() | | 20: TypeScript installing typescript and running the typescript compiler tsc | [Readme]() | | 21: Configure typescript project to compile all files in typescript. | [Readme]() | | 22: Integrating with Build Tools | [Readme]() | | 23: Using TypeScript with RequireJS | [Readme]() | | 24: TypeScript with AngularJS | [Readme]() | | 25: TypeScript with SystemJS | [Readme]() | | 26: Using TypeScript with React (JS & native) | [Readme]() | | 27: TSLint - assuring code quality and consistency | [Readme]() | | 28: tsconfig.json | [Readme]() | | 29: Debugging | [Readme]() | | 30: Unit Testing | [Readme]() |",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon myTs.ts"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/pro-js/typeScript-Professionals.git"
+  },
+  "author": "Morol",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/pro-js/typeScript-Professionals/issues"
+  },
+  "homepage": "https://github.com/pro-js/typeScript-Professionals#readme",
+  "devDependencies": {
+    "typescript": "^3.9.5"
+  },
+  "dependencies": {
+    "ts-node": "^8.10.2"
+  }
+}