Q331. What is the purpose of breakpoints in debugging?
You can set breakpoints in the javascript code once the debugger statement is executed and the debugger window pops up. At each breakpoint, javascript will stop executing...
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Q332. What are hooks?
Hooks is a special JavaScript function that allows you use state and other React features without writing a class. This pattern has been introduced as a new feature in Re...
Q333. Can I use reserved words as identifiers?
No, you cannot use the reserved words as variables, labels, object or function names. Let's see one simple example, ```javascript var else = "hello"; // Uncaught SyntaxEr...
Q334. What rules need to be followed for hooks?
You need to follow two rules in order to use hooks, 1. **Call Hooks only at the top level of your react functions:** You should always use hooks at the top level of react...
Q335. How do you detect a mobile browser?
You can use regex which returns a true or false value depending on whether or not the user is browsing with a mobile. ```javascript window.mobilecheck = function () { var...
Q336. How to ensure hooks followed the rules in your project?
React team released an ESLint plugin called **eslint-plugin-react-hooks** that enforces Hook's two rules. It is part of Hooks API. You can add this plugin to your project...
Q337. How do you detect a mobile browser without regexp?
You can detect mobile browsers by simply running through a list of devices and checking if the useragent matches anything. This is an alternative solution for RegExp usag...
Q338. What are the differences between Flux and Redux?
The biggest conceptual difference is the data flow itself: ``` Flux: View ↓ Action ↓ Dispatcher ↓ Multiple Stores ↓ View ``` versus: ``` Redux: View ↓ Action ↓ Middleware...
Q339. How do you get the image width and height using JS?
You can programmatically get the image and check the dimensions(width and height) using JavaScript. ```javascript var img = new Image(); img.onload = function () { consol...
Q340. What are the benefits of React Router V4?
Below are the main benefits of React Router V4 module, 1. In React Router v4(version 4), the API is completely about components. A router can be visualized as a single co...