Q141. What is the difference between React Native and React?
**React** is a JavaScript library, supporting both front end web and being run on the server, for building user interfaces and web applications. **React Native** is a mob...
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Q142. How to test React Native apps?
React Native can be tested only in mobile simulators like iOS and Android. You can run the app in your mobile using expo app (https://expo.io) Where it syncs using QR cod...
Q143. How to do logging in React Native?
You can use `console.log`, `console.warn`, etc. As of React Native v0.29 you can simply run the following to see logs in the console: ``` $ react-native log-ios $ react-n...
Q144. How to debug your React Native?
Follow the below steps to debug React Native app: 1. Run your application in the iOS simulator. 2. Press `Command + D` and a webpage should open up at `http://localhost:8...
Q145. What is reselect and how it works?
_Reselect_ is a **selector library** (for Redux) which uses _memoization_ concept. It was originally written to compute derived data from Redux-like applications state, b...
Q146. What is Flow?
_Flow_ is a _static type checker_ designed to find type errors in JavaScript. Flow types can express much more fine-grained distinctions than traditional type systems. Fo...
Q147. What is the difference between Flow and PropTypes?
Flow is a _static analysis tool_ (static checker) which uses a superset of the language, allowing you to add type annotations to all of your code and catch an entire clas...
Q148. How to use Font Awesome icons in React?
The below steps followed to include Font Awesome in React: 1. Install `font-awesome`: ```console $ npm install --save font-awesome ``` 2. Import `font-awesome` in your `i...
Q149. What is React Dev Tools?
_React Developer Tools_ let you inspect the component hierarchy, including component props and state. It exists both as a browser extension (for Chrome and Firefox), and ...
Q150. Why is DevTools not loading in Chrome for local files?
If you opened a local HTML file in your browser (`file://...`) then you must first open _Chrome Extensions_ and check `Allow access to file URLs`.