Top 30 ReactJs Interview Questions | Toughness Level 💯 | Experienced level 😇 |
#reactjs #frontenddeveloper #interviewquestions
ReactJs is the most popular🔥 front-end technology that most of the companies are using,
I have created a compilation of selected questions from Basic to Advanced level for #ReactJsInterview. Below are the topics📝 covered in this video...
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✅ ReactJs Component
✅ Testing in ReactJs
✅ Code Modularisation
✅ Error Boundaries
✅ Routing
✅ Redux
✅ Styled Components
✅ Javascript
✅ DOM Concept
🧲 ANSWER to few of the questions in the video ⬇︎⬇︎⬇︎, Check The EXPLANATIONS 🔥💯
1️⃣ What are portals in react ⁉️
🟢 If you need to write a code outside the root container How would you do that?
☞ There comes the PORTAL.
It renders an element outside of its parent component’s DOM node.
When we create a new react project we target our codes to the default "root" element mentioned in the index.html file. By using Portals you can manage to render outside of the parent DOM element.
along with div id="root" /div note:- angled brackets are not allowed in YT Description.
You can create a new container: div id="rootTwo" /div. and target your new component to "rootTwo".
A Portal can be created using ReactDOM.create portal( Child, Container )
🅰️ Child: It can be a fragment, any HTML element, or a plain String
🅱️ Container: It's the newly created container i.e. "rootTwo"
2️⃣ Controlled and Uncontrolled Components ⁉️
🟢 🔸 Normal HTML FORMS are basically UNCONTROLLED components where you don't need to change or update any state. In fact whatever the value you submit you get the same.
🔸 While, In the CONTROLLED component whenever you type any character/space in the form, it is considered as a change. The CHANGED VALUE is handled by using callback functions like onChange, onClick...
e.g. input type="text" name="email" id="email data" value={email}
TYPE, NAME, VALUE:- These 3 elements are the factors to make your form controlled wherein you can handle/change each of the terms individually, using the callback functions mentioned above.
3️⃣ What are the Keys in React?
🟢 Keys help React identify which items have CHANGED, ADDED, or REMOVED. Thereby it enhances the performance of the app. It basically distinguishes between the elements from each other.
4️⃣ What is Unit Testing?
🟢 The goal of unit testing is to isolate each part of the program and show that the individual parts are correct. It finds the problem early in the development cycle. Unit testing is an essential part of checking the quality of the code. It ensures the security and high performance of the app which ultimately helps in time saving and customer satisfaction. Jest is a javascript framework that helps in testing the components.
5️⃣ What is code splitting in React?
🟢 It is a method to split a code from a large file into smaller code bundles which can be loaded when there is a demand. It makes our code more efficient and helps in the optimization of our React app.
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