Posts Tagged ‘React’

Getting Started with Testing React Component

Thursday, January 23rd, 2020

Introduction and background

ReactJs is a very popular open-source JavaScript library that is used for front-end development. It is extremely flexible and user-friendly, which makes it easy for developers to play around with state and props in React Components. This, in turn, helps to make the app more attractive and interactive.

React is maintained by Facebook, along with a worldwide community of companies and individual developers. It is great for fetching data that changes rapidly and which needs to be recorded and is therefore used as a base in the development of mobile apps and single-page applications.

In simple words, React allows developers to create web applications that are capable of changing data without having to reload the page. The main advantages that React offers include ease of use, simplicity, and scalability. It is also very fast, making it highly efficient.

Challenge

When developers work on a React app, they often play with state and props to make their apps more interactive and appealing. During development, everything may seem to work fine, but in many cases, the app faces issues once it is rolled out into the market when it is used by real people in the real world. This is because, oftentimes, some of the use cases of the app fail.

When you develop a web application, and you don’t run any test, it means that the beta testers will be the users in the real world, which is extremely risky. Besides, if your app fails, you cannot blame others for not trusting an untested code.

Unit testing of apps is required for the following reasons –

  • To ensure that each part of the program is correct individually.
  • To check out input validation logic and data transformation.
  • To check any isolated operation.
  • It helps in writing a test-driven approach.
  • Make sure the right things render when they are meant to.

Solution

To carry out efficient and reliable unit testing, Jest and Enzyme are required. Jest is a JavaScript testing framework that is developed by Facebook, with its main advantage being that it is very easy to use while being fast and safe. Code coverage, great expectations, snapshots, and easy mocking are other benefits. Create React App is then shipped with a ready-to-use Jest setup.

The Enzyme is a JavaScript testing utility for React, which can be used for easily asserting, manipulating, and traversing the output of your React Component. It was created by Airbnb and is quite popular since it adds several additional utility methods that are used for rendering a component(s), as well as finding and interacting with elements.

So, Jest is used as the test runner, assertion library, and mocking library, while Enzyme is used to provide additional testing utilities to interact with elements.

Benefits of React Native vs Xamarin: An Easy Comparison Guide

Thursday, January 23rd, 2020

React Native and Xamarin both offer their own sets of pros and cons when it comes to cross-platform app development. Which one is right for you?

Today, React Native and Xamarin are among the most popular tools used for cross-platform app development. But how do you know which one is the right choice for your project?

Using the right tools is critical for app developers because it affects the usability and success of the app. Especially for apps that are to be available on both iOS and Android, seamless functioning on both platforms can be achieved with the right tool.

To help you make the right choice, we compare React Native and Xamarin on various criteria below:

Availability

React Native is completely free, even for businesses. It is an open-source JavaScript-based framework. It also has a very large developer community compared to Xamarin.

Xamarin is also open-source. However, despite there being a free version, you need to spend for enterprise-level applications because the free version doesn’t do much.

Market share

React Native is widely used by tons of top graphic designing companies as well as corporations worldwide, including Fortune500 companies. The Guardian, Skype, Facebook, Walmart, and Tesla are just a few of the companies that use React Native.

For the past six years, Xamarin has been used by tens of thousands of companies everywhere, right from startups to huge corporations. Notable apps such as CA Mobile and Story have been developed using Xamarin. Top UX design firms have built many successful apps and websites using this tool.

Code compilation

For developing apps for Android, React Native uses JIT (Just-in-time) compilation. However, this is not applicable for iOS apps as Apple does not allow dynamically generated codes to be executed on its devices. So, React Native has no option but to interpret the JavaScript code.

When it comes to code compilation, a top app design agency would prefer Xamarin. This is because it uses C# as its codebase, which uses JIT compilation for Android apps while using AOT (Ahead-of-Time) compilation for iOS apps. Thus, compiling managed codes is much easier.

Development environment

React Native allows developers to use an IDE and text editor that they are comfortable with. It also has a Live Reload feature, whereby developers can see the effects of the changes they have made in real-time.

Xamarin is a winner here because of how user-friendly it is, allowing developers to write code on both Windows and iPhone app. The code can be later compiled on a Mac after writing on Windows.

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