Technically Speaking

Array Extensions Library- Unit Test This post is second in series of creating Array Extension Library  In this post we will learn how we can add unit test cases to our library. We will use Jasmine framework to Unit test our library. For that, use below command. >> npm install jasmine As we have developed our library in typescript, it will convenient to add typing for Jasmine as well. To install typing for Jasmine. Use below command. >> npm uninstall @types/jasmine   After running these commands, our package.config will look like Now, we will add new file named extension.spec.ts under test  directory. In this file we will import extension library first. We will now define one class named Heros,   Which we use to create Array  and test all our extension methods against it. Now we will describe our test suite using describe function provided by Jasmine. And initialize arrays with our primitive and custom type(Heros)   in beforeEach function provided by jasmine. Now, we will

  Array Extension methods - Typescript     This is step by step guide to create custom library for extension method on Javascript Array using Typescript. Tools and framework we are going to use are Visual studio code , which you can download from here . Framework : NodeJs Open Command prompt and type following commands mkdir demo-extension-lib cd demo-extension-lib We are in your target directory, type following command npm init npm will guide you through the series of questions. Which you can change according to your requirement or go with the default ones. Once npm  is done with initialization,  Open demo-extension-lib in any editor of your choice. We will use Visual Studio Code for our demo. You will se single file package.json as we do not have any other library install. We will start by adding two directory src - for source code and test - to add test cases. Add type script file with name extension.ts. In that file, declare Array interface to global namespace One thing to not