Technical Question Bank · Peer-Reviewed
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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)...
It is possible. Below are the possible options: ```jsx harmony render() { return false } ``` ```jsx harmony render() { return true } ``` ```jsx harmony render() { return ...
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...
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...
You just need to use `HTTPS=true` configuration. You can edit your `package.json` scripts section: ```json "scripts": { "start": "set HTTPS=true && react-scripts start" }...
Create a file called `.env` in the project root and write the import path: ``` NODE_PATH=src/app ``` After that restart the development server. Now you should be able to ...
You need to use `setInterval()` to trigger the change, but you also need to clear the timer when the component unmounts to prevent errors and memory leaks. ```javascript ...
React's _reconciliation_ algorithm assumes that without any information to the contrary, if a custom component appears in the same place on subsequent renders, it's the s...
You can use ES7 `static` field to define constant. ```javascript class MyComponent extends React.Component { static DEFAULT_PAGINATION = 10; } ```
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...
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