What happens if you omit dependencies in the dependency array of useEffect?
If you omit dependencies in the dependency array of useEffect
, the effect will run after every render. This means that the effect will be executed on the initial render and after every subsequent re-render, regardless of whether any specific values have changed.
Javascript
import React, { useEffect, useState } from 'react' ; function App() { const [count, setCount] = useState(0); useEffect(() => { console.log( "See the Effect here" ); }); return ( <div> <p>Count: {count}</p> <button onClick={() => setCount(count + 1)}> Increment </button> </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.