Q641. 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...
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Q642. 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...
Q643. 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...
Q644. 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...
Q645. How do you make synchronous HTTP request?
Browsers provide an XMLHttpRequest object which can be used to make synchronous HTTP requests from JavaScript. ```javascript function httpGet(theUrl) { var xmlHttpReq = n...
Q646. In which scenarios do error boundaries not catch errors?
Below are the cases in which error boundaries don't work, 1. Inside Event handlers 2. Asynchronous code using **setTimeout or requestAnimationFrame** callbacks 3. During ...
Q647. How do you convert date to another timezone in javascript?
You can use the toLocaleString() method to convert dates in one timezone to another. For example, let's convert current date to British English timezone as below, ```java...
Q648. What is the behavior of uncaught errors in react 16?
**Note:** This behavior was introduced in React 16 and continues in React 18/19. In React 16+, errors that are not caught by any error boundary will result in unmounting ...
Q649. What are the properties used to get size of window?
You can use innerWidth, innerHeight, clientWidth, clientHeight properties of windows, document element and document body objects to find the size of a window. Let's use a...
Q650. What is the proper placement for error boundaries?
The granularity of error boundaries usage is up to the developer based on project needs. You can follow either of these approaches, 1. You can wrap top-level route compon...