Q601. What are the benefits of keeping declarations at the top?
It is recommended to keep all declarations at the top of each script or function. The benefits of doing this are, 1. Gives cleaner code 2. It provides a single place to l...
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Q602. Why React tab is not showing up in DevTools?
When the page loads, _React DevTools_ sets a global named `__REACT_DEVTOOLS_GLOBAL_HOOK__`, then React communicates with that hook during initialization. If the website i...
Q603. What are the benefits of initializing variables?
It is recommended to initialize variables because of the below benefits, 1. It gives cleaner code 2. It provides a single place to initialize variables 3. Avoid undefined...
Q604. What are Styled Components?
`styled-components` is a JavaScript library for styling React applications. It removes the mapping between styles and components, and lets you write actual CSS augmented ...
Q605. What are the recommendations to create new object?
It is recommended to avoid creating new objects using `new Object()`. Instead you can initialize values based on it's type to create the objects. 1. Assign {} instead of ...
Q606. Give an example of Styled Components?
Lets create `` and `` components with specific styles for each. ```javascript import React from "react"; import styled from "styled-components"; // Create a component tha...
Q607. How do you define JSON arrays?
JSON arrays are written inside square brackets and arrays contain javascript objects. For example, the JSON array of users would be as below, ```javascript "users":[ {"fi...
Q608. What is Relay?
Relay is a JavaScript framework for providing a data layer and client-server communication to web applications using the React view layer. ## Miscellaneous
Q609. How do you generate random integers?
You can use `Math.random()` with `Math.floor()` to return random integers. For example, if you want generate random integers between 1 to 10, the multiplication factor sh...
Q610. What are the main features of Reselect library?
Let's see the main features of Reselect library, 1. Selectors can compute derived data, allowing Redux to store the minimal possible state. 2. Selectors are efficient. A ...