How do you conditionally run effects with useEffect?
18. What are the rules of Hooks?
20. What happens if you omit dependencies in the dependency array of useEffect?
To conditionally run effects with useEffect
in React, you can use the dependency array as the second argument to specify the values that the effect depends on. By updating these dependencies, you can control when the effect should run.
Javascript
import React, { useEffect, useState } from 'react' ; import { fetchData } from './actions/actions' ; function App({ condition }) { const [data, setData] = useState( null ); useEffect(() => { if (condition) { fetchData().then(result => setData(result)); } }, [condition]); return ( <div> {data ? ( <p> Data available: {data} </p> ) : ( <p>No data available</p> )} </div> ); } export default App; |
Top React Hooks Interview Questions & Answers
In this article, you will learn React Hooks interview questions and answers that are most frequently asked in interviews. Before proceeding to learn React Hooks interview questions and answers, first learn the complete React Hooks.
React hooks are functions that enable functional components to use state and lifecycle features that were previously only available in class components. Hooks provide functions like useState, useEffect, useContext, etc., that allow you to “hook into” React features from functional components.
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