ClearTrail Technologies Software Engineer Interview Questions and Answers

Q1. Reverse a linked list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, previous, and next

• Iterate through the linked list, updating pointers to reverse the direction

• Update the head of the linked list to be the last node visited
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Q1. What is promise
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used in JavaScript to handle asynchronous operations.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and failure callbacks.

• Example: Fetching data from an API returns a promise that resolves with the data or rejects with an error.
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Q2. What is hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.
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Q1. What is event loop
Ans. 
Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.
• Event loop is commonly used in JavaScript to handle asynchronous operations like setTimeout, setInterval, and AJAX requests.

• It allows for non-blocking I/O operations, ensuring that the program can continue running while waiting for I/O operations to complete.

• Event loop works by contin...read more
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Logical reasoning and verbals

Data science and computer networking

Q1. Dbms and oops ,data science and objects orientation
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Q2. Demand paging and network topology
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Q3. Difference between tcp and udp
Ans. 
TCP is connection-oriented, reliable, and slower, while UDP is connectionless, unreliable, and faster.
• TCP is connection-oriented, meaning a connection must be established before data can be transmitted.

• TCP is reliable, as it ensures that all data is received in the correct order without errors.

• UDP is connectionless, meaning data can be sent without establishing a connection first.

• UDP is unreliable, as it does not guara...read more
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Q4. Computer networking and types of topology
Ans. 
Computer networking involves connecting multiple devices to share resources and information. Different types of network topologies include bus, star, ring, mesh, and hybrid.
• Bus Topology: All devices are connected to a single cable, like a bus route.

• Star Topology: All devices are connected to a central hub, like a star.

• Ring Topology: Each device is connected to two other devices, forming a ring.

• Mesh Topology: Every devi...read more
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Q5. Binarysearch and linked list of nodes bounded
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Q1. Polyfills , basic react app
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Q1. Question on DSA, Trees
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Carbon footprint and ways to achieve

1. which data structure is used to create an editor?

Basic grammer, maths questions,

Q1. Basic questions on programming languages
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Q2. Oops concepts, collections, method overloading, method overriding
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Q1. Tell me about your self?
Ans. 
I am a software engineer with experience in developing and maintaining software applications.
• Proficient in programming languages such as Java, C++, and Python

• Experience in developing web applications using frameworks like Spring and Django

• Strong problem-solving and analytical skills

• Familiarity with version control systems like Git

• Ability to work in a team and collaborate effectively
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Q2. What is your salary expectations?
Ans. 
I am open to discussing salary based on the responsibilities and requirements of the position.
• I am flexible and open to negotiation.

• I am looking for a competitive salary based on my skills and experience.

• I am interested in discussing the overall compensation package, including benefits and bonuses.

• I am open to considering other forms of compensation, such as stock options or profit sharing.

• I would like to learn more ab...read more
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Matrix and logical assigment questions

Coding question on DSA