Q341. 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...
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Q342. Can you describe about componentDidCatch lifecycle method signature?
The **componentDidCatch** lifecycle method is invoked after an error has been thrown by a descendant component. The method receives two parameters, 1. error: - The error ...
Q343. How do you make asynchronous HTTP request?
Browsers provide an XMLHttpRequest object which can be used to make asynchronous HTTP requests from JavaScript by passing the 3rd parameter as true. ```javascript functio...
Q344. 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 ...
Q345. 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...
Q346. 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 ...
Q347. 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...
Q348. 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...
Q349. What is a conditional operator in javascript?
The conditional (ternary) operator is the only JavaScript operator that takes three operands which acts as a shortcut for `if` statements. ```javascript var isAuthenticat...
Q350. What is the benefit of component stack trace from error boundary?
Apart from error messages and javascript stack, React16 will display the component stack trace with file names and line numbers using error boundary concept. For example,...