Tech Mahindra Web Developer Interview Questions, Process, and Tips

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Q1. What was your weekness
Ans. 
My weakness is that I tend to overthink and get too caught up in details.
• I have a tendency to spend too much time on small details

• I sometimes struggle with making decisions quickly

• I am working on improving my time management skills to avoid getting bogged down in details
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Q2. There is no weakness in me if have I will work on it and I will change it to strength.
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Q1. What is React.js and what are its key features?
Ans. 
React.js is a JavaScript library for building user interfaces.
• React.js is a popular front-end library developed by Facebook.

• It allows developers to build reusable UI components.

• React.js uses a virtual DOM for efficient rendering and updates.

• It follows a component-based architecture, making it easy to manage and maintain code.

• React.js supports server-side rendering for improved performance and SEO.

• It has a rich ecosyste...read more
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Q2. Explain the concept of Vitual DOM in React.
Ans. 
Virtual DOM is a concept in React where a lightweight copy of the actual DOM is created and manipulated for efficient rendering.
• Virtual DOM is a JavaScript representation of the actual DOM.

• It allows React to efficiently update and render only the necessary parts of the UI.

• When there are changes in the state or props, React creates a new virtual DOM tree and compares it with the previous one.

• React then updates only the ...read more
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Q3. What is JSX and why is it used in React.
Ans. 
JSX is a syntax extension for JavaScript used in React to write HTML-like code in JavaScript.
• JSX allows developers to write HTML-like code in JavaScript, making it easier to create and manipulate UI components.

• It combines the power of JavaScript and HTML into a single syntax, allowing developers to write more expressive and concise code.

• JSX is transpiled into regular JavaScript code by tools like Babel before being exe...read more
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Q4. Explain the concept of state in React.
Ans. 
State in React is a JavaScript object that stores data and controls the behavior of a component.
• State is used to manage and update data within a component.

• It is mutable and can be changed using the setState() method.

• State allows components to re-render and reflect changes in the UI.

• State is local and specific to each instance of a component.

• State can be passed down to child components as props.
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Q5. What is the difference between state and props in reaact?
Ans. 
State is mutable and managed within a component, while props are immutable and passed from parent to child components.
• State is used to manage internal data within a component.

• Props are used to pass data from parent to child components.

• State can be changed using the setState() method.

• Props are read-only and cannot be modified by the component receiving them.

• State is local to a component, while props can be accessed by m...read more
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Q6. Describe the component lifecycle in React.
Ans. 
The component lifecycle in React refers to the different stages a component goes through from creation to deletion.
• The lifecycle methods in React can be divided into three main phases: Mounting, Updating, and Unmounting.

• During the Mounting phase, the component is created and inserted into the DOM.

• During the Updating phase, the component can be re-rendered due to changes in props or state.

• During the Unmounting phase, th...read more
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Q7. What is React Router, and how does it works?
Ans. 
React Router is a library that allows for routing in React applications, enabling navigation between different components.
• React Router is a popular routing library for React applications.

• It provides a way to handle navigation and rendering of different components based on the URL.

• React Router uses a declarative approach, allowing developers to define routes using components.

• It supports different types of routing, inclu...read more
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Q8. How does data flow in React?
Ans. 
Data flows in React through a unidirectional flow called props and state.
• Data flows from parent components to child components through props.

• Child components can modify the data by calling functions passed as props.

• State is used to manage data within a component and can be updated using setState().

• Changes in state trigger re-rendering of the component and its child components.
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Q9. What is the significance of keys in React list?
Ans. 
Keys in React list help identify and track individual items, improving performance and enabling efficient updates.
• Keys help React identify which items have changed, been added, or been removed in a list.

• They help improve performance by allowing React to reuse existing DOM elements instead of creating new ones.

• Keys also help maintain component state and prevent unnecessary re-rendering of components.

• Keys should be uniqu...read more
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Q10. How does React handle forms?
Ans. 
React handles forms using controlled components and state management.
• React uses controlled components to manage form input state.

• Form input values are stored in the component's state and updated through event handlers.

• React provides event handlers like onChange to handle form input changes.

• Form submission can be handled using onSubmit event handler.

• Validation and error handling can be implemented using conditional rend
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