React Developer concepts you must know as a React Developer in 2023
Introduction to the React Developer concepts
So we have some React developer concepts you, as a React developer would be interested in.
We have created a list of pitfalls and ideas related to how state and effects operate in React. I am confident that you will learn something new today!
Is React easy?
React is an easy-to-use and learn front-end library. But there are some concepts that a developer should know to write performant and efficient code.
Deriving the State
Let us illustrate with an example. Assume you have a select element that contains the user ids of several users. A userId state variable is being used to monitor the specified user id.
import { useState } from "react"const users = [ { id: "1", name: "User One" }, { id: "2", name: "User Two" }, { id: "3", name: "User Three" },]function Users () { const [userId, setUserId] = useState("1") return( <select value={userId} onChange={e => setUserId(e.target.value)}> <option value="1">User One</option> <option value="2">User Two</option> <option value="3">User Three</option> </select> );}You should additionally display the selected user on the screen. So, using the useEffect hook, you create another state variable named selectedUser and set it whenever the userId changes.
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Let us talk about another React Developer concept
Functions for cleaning up
The useEffect hook lets you to return a function that executes before the following render’s useEffect and also before unmounting the component. This method can be used to unsubscribe from events that the component no longer requires.
useEffect(() => { button.addEventListener("click", listener) return () => { button.removeEventListener("click", listener) }}, [])