Q801. How do you detect primitive or non primitive value type?
In JavaScript, primitive types include boolean, string, number, BigInt, null, Symbol and undefined. Whereas non-primitive types include the Objects. But you can easily id...
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Q802. How to programmatically trigger click event in React?
You could use the ref prop to acquire a reference to the underlying `HTMLInputElement` object through a callback, store the reference as a class property, then use that r...
Q803. What is babel?
Babel is a JavaScript transpiler to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments. Some of...
Q804. How to make AJAX call and in which component lifecycle methods should I make an AJAX call?
You can use AJAX libraries such as Axios, jQuery AJAX, and the browser built-in `fetch`. You should fetch data in the `componentDidMount()` lifecycle method. This is so y...
Q805. Is Node.js completely single threaded?
Node is a single thread, but some of the functions included in the Node.js standard library(e.g, fs module functions) are not single threaded. i.e, Their logic runs outsi...
Q806. What are render props?
**Render Props** is a technique for sharing code/logic between components using a prop whose value is a function that returns a React element. Instead of duplicating stat...
Q807. What are the common use cases of observables?
An **Observable** (popularized by RxJS and reactive programming) represents a lazy, push-based stream of multiple values emitted over time. Observables excel at handling ...
Q808. How to dispatch an action on load?
You can dispatch an action in `componentDidMount()` method and in `render()` method you can verify the data. ```javascript class App extends Component { componentDidMount...
Q809. What is RxJS?
RxJS (Reactive Extensions for JavaScript) is a library for implementing reactive programming using observables that makes it easier to compose asynchronous or callback-ba...
Q810. How to use `connect()` from React Redux?
You need to follow two steps to use your store in your container: 1. **Use `mapStateToProps()`:** It maps the state variables from your store to the props that you specif...