Capgemini Golang Developer Interview Questions and Answers

Golang Basics, DBMS, Channels, Unit Test

Q1. Give me flow of code and explain code
Ans. 
Code flow refers to the sequence of execution in a program, detailing how functions and statements are processed.
• 1. Start with the main function: The entry point of a Go program is the 'main' function, where execution begins.

• 2. Function calls: When a function is called, control is transferred to that function, executing its code block.

• 3. Control flow statements: Use of 'if', 'for', and 'switch' statements to direct the...read more
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Q2. Unsort the sort slice
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To unsort a sorted slice in Go, you can use randomization or shuffle techniques to achieve a non-deterministic order.
• Use the 'math/rand' package: You can shuffle a slice using the 'Shuffle' function from the 'math/rand' package.

• Example: 'rand.Shuffle(len(slice), func(i, j int) { slice[i], slice[j] = slice[j], slice[i] })' will randomize the order of elements.

• Custom Shuffle: Implement your own shuffle algorithm, like th...read more
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Q3. Give me output of code
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Q1. Basic go questions
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Q1. Go coding programs
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Q1. General HR questions and salary discussion
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Q1. Explain buffered and unbuffered channel
Ans. 
Buffered channels allow multiple senders to send data without blocking, while unbuffered channels block until data is received.
• Buffered channels have a fixed capacity and can store multiple values until they are received

• Unbuffered channels have no capacity and block until a receiver is ready to receive the data

• Buffered channels are useful for improving performance in cases where there are multiple senders

• Unbuffered cha...read more
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Q2. Tell about your self,briefly explain your project
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I am a Golang developer with experience in building scalable web applications.
• Developed a RESTful API using Golang and MongoDB for a social media platform

• Implemented authentication and authorization using JWT

• Optimized database queries for improved performance

• Utilized Goroutines and channels for concurrent processing

• Integrated third-party APIs for data retrieval and processing
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Q3. Why we use go,advantages of golang,does any other language support garbage collection,go routines why we use'multithreading
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Go is a fast, efficient, and easy-to-learn programming language with built-in concurrency features.
• Advantages of Go include its speed, simplicity, and concurrency features.

• Garbage collection is supported by other languages such as Java, Python, and Ruby.

• Go routines allow for easy and efficient concurrency without the need for traditional multithreading.

• Go is used by companies such as Google, Uber, and Dropbox for its p...read more
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Q4. What is channel,explains types of channel
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A channel is a way for goroutines to communicate with each other and synchronize their execution.
• Channels are typed and can only transmit values of that type.

• There are two types of channels: buffered and unbuffered.

• Unbuffered channels block until a sender and receiver are ready to communicate.

• Buffered channels have a fixed capacity and can transmit values without blocking until the buffer is full.

• Channels can be used t...read more
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Q5. Difference between buffered channel and unbuffered channel,error handling methods,how you solve error
Ans. 
Buffered channels have a fixed capacity while unbuffered channels have no capacity limit.
• Buffered channels allow sending multiple values without blocking until the buffer is full.

• Unbuffered channels block until the sender and receiver are both ready to communicate.

• Error handling methods include returning errors as values, using panic and recover, and logging errors.

• Errors can be solved by identifying the root cause, im...read more
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Q6. Can we return difference data type and how ,what architeture you worked in your project,does go have oops concepts
Ans. 
Yes, Go allows returning different data types. Go has OOP concepts and I have worked with microservices architecture.
• Go allows returning different data types using interfaces.

• I have worked with microservices architecture using Go and Docker.

• Go has OOP concepts like structs and methods.
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Q7. Define empty interface and empty struct,difference between array and slice,difference between function and method
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Questions on Go programming language concepts
• Empty interface is an interface with no methods. Empty struct is a struct with no fields.

• Array has fixed size, slice is dynamic. Array is passed by value, slice is passed by reference.

• Function is standalone, method is associated with a type. Method has a receiver, function does not.
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Q8. Do you know dockers and kubernets,what is docker used for, how you do unit testing how many looping concepts we have in go what is go path and go root
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Q9. What is complicity faced in your project write a program on sorting
Ans. 
Complicity faced in project: Handling concurrent requests and ensuring data consistency
• Implemented mutex locks to prevent race conditions

• Used channels to coordinate communication between goroutines

• Ensured atomicity of operations on shared data

• Implemented retry mechanisms to handle failed requests
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