What is useEffect Hooks?
useEffect Hooks is used to connect component to an external system. In this the depenedeny array specifies when the effect should run based on changes in its dependencies and when the dependency array is absent in useEffect
, the effect will run after every render.
When you provide dependencies in the dependency array of useEffect
, the effect will run:
- Initially after the first render.
- Whenever any of the dependencies change between renders.
- If the dependencies are an empty array (
[]
), the effect will only run once after the initial render, similar tocomponentDidMount
in class components.
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.
Contact Us