DigiBoxx Software Engineer Trainee Interview Questions and Answers

This was a 5 Hour Long codathon (with option to make utmost team of 4) and the Problem statement would be some real world question and everyone is free to choose any language, framework or tech stack of their choice to work on. Its better to make a team and try because there maybe problem requiring Frontend, Backend, API and Authentication etc. The codathon will be very acquainting and selected or rejected but you'll learn a lot from it and meet like minded friends too.

Q1. The 2nd Round will be presentation round. Here your team will be called in Digiboxx Office in a week for presentation of your codathon project that you got. You have to present the code and explain the wor...read more
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Q1. The 3rd Round was Technical interview round, questions will be based from your CV and Projects. So as mine was full stack development. So questions was from there and from my web development project of cry...read more
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Q2. What are Components and state in ReactJs?
Ans. 
Components are reusable UI elements in ReactJs. State is an object that stores data and controls a component's behavior.
• Components are like building blocks that can be combined to create complex UIs

• State is used to store and manage data within a component

• Changes to state trigger a re-render of the component

• State should be kept as minimal as possible to avoid performance issues

• Example: A button component can have a stat...read more
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Q3. What is life cycle in ReactJS ?
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ReactJS life cycle refers to the series of methods that are invoked in the process of creating, updating and destroying a component.
• ReactJS life cycle consists of three phases: Mounting, Updating and Unmounting.

• Mounting phase includes methods like constructor, render, componentDidMount.

• Updating phase includes methods like shouldComponentUpdate, render, componentDidUpdate.

• Unmounting phase includes method componentWillUn...read more
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Q4. What are Hooks in ReactJs and Explain useState, useRef, useEffect Hooks with their usecases?
Ans. 
Hooks are functions that allow us to use state and other React features in functional components.
• useState is a hook that allows us to add state to functional components.

• useRef is a hook that allows us to create a mutable reference that persists across renders.

• useEffect is a hook that allows us to perform side effects in functional components.

• useState example: const [count, setCount] = useState(0);

• useRef example: const ...read more
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Q5. What Algorithm you used in your Project?
Ans. 
I used the Dijkstra's algorithm for finding the shortest path in my project.
• Implemented Dijkstra's algorithm to find the shortest path between nodes in a graph

• Used priority queue to optimize the algorithm

• Considered edge weights and node distances while calculating the shortest path
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Q6. Explain Local Storage, Session Storage, cache in Web development
Ans. 
Local Storage, Session Storage, and Cache are used to store data in the browser for faster access and better user experience.
• Local Storage: stores data with no expiration date and can be accessed across multiple windows and tabs

• Session Storage: stores data for a single session and is cleared when the session ends

• Cache: stores data temporarily to reduce server load and improve performance

• Examples: storing user preferenc...read more
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Q7. Purpose of getDerivedStateFromProps() and getSnapshotBeforeUpdate() Lifecyle method?
Ans. 
getDerivedStateFromProps() updates state based on props changes. getSnapshotBeforeUpdate() captures current state before update.
• getDerivedStateFromProps() is called before rendering and updates state based on changes in props.

• getSnapshotBeforeUpdate() is called after rendering but before updating the DOM. It captures current state before update.

• getDerivedStateFromProps() is a static method and should return an object t...read more
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Q8. How can you compose multiple HOCs with render props in a React component
Ans. 
Compose multiple HOCs with render props in a React component
• Create a render prop component that accepts a function as a prop

• Wrap the render prop component with HOCs

• Pass the function as a prop to the HOCs

• Use the function to render the component's content

• Example: withAuth(withTheme(RenderPropComponent))
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Q9. WeakMap and WeakSet in Javascript?
Ans. 
WeakMap and WeakSet are specialized collections in JavaScript that allow for weak references to objects.
• WeakMap allows for mapping of objects to values where the object keys are weakly referenced.

• WeakSet is a collection of objects where the objects are weakly referenced.

• Weak references allow for objects to be garbage collected if they are no longer referenced elsewhere.

• WeakMap and WeakSet are useful for scenarios where...read more
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Q10. Explain setTimeout, setImmediate and process.nextTick ?
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setTimeout, setImmediate and process.nextTick are Node.js functions used for asynchronous programming.
• setTimeout is used to execute a function after a specified amount of time has passed.

• setImmediate is used to execute a function immediately after the current event loop iteration.

• process.nextTick is used to execute a function at the beginning of the next event loop iteration.

• setTimeout and setImmediate are similar, but...read more
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Q1. Introduce Yourself ?
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Q2. 3 4 Project Viewing and basic cross questions
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Q3. Salary Discussion and Company Policies Discussion
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Q4. Question related to Digiboxx and what I know about its services ?
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