Q781. What are tasks in event loop?
A task is any javascript code/program which is scheduled to be run by the standard mechanisms such as initially starting to run a program, run an event callback, or an in...
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Q782. How to listen to state changes?
The `componentDidUpdate` lifecycle method will be called when state changes. You can compare provided state and props values with current state and props to determine if ...
Q783. What is microtask?
A microtask is a type of JavaScript callback that is scheduled to run immediately after the currently executing script and before the next event loop tick. Microtasks are...
Q784. What is the recommended approach of removing an array element in React state?
The better approach is to use `Array.prototype.filter()` method. For example, let's create a `removeItem()` method for updating the state. ```javascript removeItem(index)...
Q785. What are different event loops?
In JavaScript, there are multiple event loops that can be used depending on the context of your application. The most common event loops are: 1. The Browser Event Loop 2....
Q786. Is it possible to use React without rendering HTML?
It is possible. Below are the possible options: ```jsx harmony render() { return false } ``` ```jsx harmony render() { return true } ``` ```jsx harmony render() { return ...
Q787. What is the purpose of queueMicrotask?
The `queueMicrotask` function is used to schedule a microtask, which is a function that will be executed asynchronously in the microtask queue. The purpose of `queueMicro...
Q788. What are the possible ways of updating objects in state?
1. **Calling `setState()` with an object to merge with state:** - Using `Object.assign()` to create a copy of the object: ```javascript const user = Object.assign({}, thi...
Q789. How do you use javascript libraries in typescript file?
It is known that not all JavaScript libraries or frameworks have TypeScript declaration files. But if you still want to use libraries or frameworks in your TypeScript fil...
Q790. What are the approaches to include polyfills in your `create-react-app`?
There are approaches to include polyfills in create-react-app, 1. **Manual import from `core-js`:** Create a file called (something like) `polyfills.js` and import it int...