Genius Technology Golang Developer Interview Questions and Answers

Golang Basics, DBMS, Channels, Unit Test

Q1. Willing to take networking certification?
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Q2. Regular expression to extract ip address
Ans. 
Use regex pattern to extract IP addresses from a string.
• Use the regex pattern '\b(?:\d{1,3}\.){3}\d{1,3}\b' to match IP addresses.

• Make sure to escape special characters like '.' and '\' in the regex pattern.

• Use tools like regex101.com to test and refine your regex pattern.

• Example: '192.168.1.1' will be matched by the regex pattern.
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1) Search an array element
2) braces balance program
3) anagrams Program

Q1. What is map and how it i useful
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A map is a built-in data structure in Golang that allows you to store key-value pairs.
• Maps are unordered collections of key-value pairs.

• Keys in a map must be unique.

• Maps are useful for efficient lookup and retrieval of values based on their keys.

• You can add, update, and delete key-value pairs in a map.

• Example: map[string]int{"apple": 5, "banana": 3}
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Q2. Explain about slice
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A slice is a dynamically-sized, flexible view of an underlying array in Go.
• Slices are similar to arrays but with a variable length.

• They are reference types and can be resized.

• Slices can be created using the make() function or by slicing an existing array.

• They provide a convenient way to work with collections of data.
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Q3. Difference between slice and array
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Arrays have fixed length, while slices are dynamic. Slices are references to arrays.
• Arrays have a fixed length, while slices can grow or shrink dynamically.

• Slices are references to arrays, allowing for efficient memory usage.

• Arrays are value types, while slices are reference types.

• Arrays are initialized with a specific size, while slices can be created from existing arrays or other slices.

• Slices provide additional func
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Q4. What are go routines
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Go routines are lightweight threads of execution that allow concurrent programming in Go.
• Go routines are created using the 'go' keyword followed by a function call.

• They are executed concurrently and independently of the main program.

• Go routines communicate with each other using channels.

• They are used to achieve concurrency and parallelism in Go programs.
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Q5. How channels are used
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Channels are used in Go to enable communication and synchronization between goroutines.
• Channels are typed and can only send or receive values of that type.

• They can be created using the built-in make() function.

• The <- operator is used to send and receive values from channels.

• Channels can be used to implement various synchronization patterns like blocking and non-blocking operations.

• They are commonly used for concurrent
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Q1. Fibanacci series using go routines
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Using Go routines to generate Fibonacci series
• Create a function to generate Fibonacci numbers using recursion

• Use Go routines to generate Fibonacci numbers concurrently

• Use channels to communicate between Go routines
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Q2. Difference between concurrency and parallelism
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Concurrency is about dealing with multiple tasks at the same time, while parallelism is about executing multiple tasks simultaneously.
• Concurrency is about structure, while parallelism is about execution.

• Concurrency can be achieved with a single core processor, while parallelism requires multiple cores.

• An example of concurrency is a single-threaded program that switches between tasks, while an example of parallelism is ...read more
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Q3. Slice and array questions
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Q4. Mutex sync race conditions
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Q1. Coding reverse string
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Reverse a string using Golang
• Use the 'strings' package in Golang to convert the string to a slice of runes

• Iterate over the slice of runes in reverse order to build the reversed string

• Convert the reversed slice of runes back to a string
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Q2. Code palindrome
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Q1. About your self.abot your project.jwt token
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Q2. Basics program on goroutines.expalin goroutine.explain parallisum and concurrency
Ans. 
Goroutines are lightweight threads of execution in Go that allow for concurrent programming.
• Goroutines are created using the 'go' keyword followed by a function call.

• Concurrency is the ability to run multiple tasks simultaneously, while parallelism is the ability to run multiple tasks at the same time.

• Goroutines can communicate with each other using channels.

• Example: go func() { fmt.Println('Hello, world!') }()

• Example:
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Q3. What is channel explain difference type of buffered and unbuffered
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Channels are a way for goroutines to communicate. Buffered channels have a capacity while unbuffered channels do not.
• Unbuffered channels block until a sender and receiver are ready to communicate

• Buffered channels allow for asynchronous communication up to a certain capacity

• Channels are typed, meaning they can only send and receive values of a specific type
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Q4. Define array and slice
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Array is a fixed-size collection of elements of the same type. Slice is a dynamic-size sequence of elements of the same type.
• Arrays have a fixed size and are declared using square brackets, e.g. var arr [5]int

• Slices are dynamic and are declared using the make() function, e.g. var s []int = make([]int, 5)

• Slices can also be created using a slice literal, e.g. s := []int{1, 2, 3}
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Q5. Dockers and commands program on logics
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Q6. Mysql qarries join and inner join
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Q1. Explain your project how do you work on unit testing
Ans. 
I have worked on various projects, including a web application for managing employee data.
• I follow the Arrange-Act-Assert pattern for unit testing

• I use testing frameworks like GoConvey and testify

• I write test cases for both positive and negative scenarios

• I use mocks and stubs to isolate dependencies

• I aim for high code coverage to ensure thorough testing
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Q2. How much you expectation salary you work on microservice or monolithic
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Q3. Difference between microservice and monolithic you work an any payment
Ans. 
Microservices are small, independent services while monolithic is a single, large application.
• Microservices are loosely coupled and can be developed and deployed independently.

• Monolithic applications are tightly coupled and require a complete redeployment for any changes.

• Microservices allow for better scalability and fault tolerance.

• Monolithic applications are easier to develop and test.

• Examples of microservices includ...read more
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Q4. Dockes and kubernets database
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Q5. Mongodb,mysql,postgres
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Q6. Project architetures,rest api,channel,goroutines,data structures
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Q7. Design pattersns explain and write a program on singelton
Ans. 
Singleton is a creational design pattern that ensures a class has only one instance and provides a global point of access to it.
• Singleton pattern restricts the instantiation of a class to one object.

• It is useful when exactly one object is needed to coordinate actions across the system.

• Singleton pattern can be implemented using lazy initialization or eager initialization.

• Example: Database connection, Logger, Configurati...read more
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Q1. What's slice datatype
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A slice is a dynamically-sized, flexible view of elements in an array in Go.
• Slices are references to arrays, allowing for efficient manipulation of data.

• They have a length and a capacity, with the length being the number of elements in the slice and the capacity being the maximum number of elements that the slice can hold.

• Slices can be created using the make() function or by slicing an existing array or slice.

• Example:
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Q2. Difference between gopath and go root
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GOPATH is the workspace for Go projects, while GOROOT is the location where Go is installed.
• GOPATH is used to store Go project files and dependencies.

• GOROOT is the location where the Go standard library and tools are installed.

• GOPATH can have multiple directories, while GOROOT is a single directory.

• Example: GOPATH=/home/user/go, GOROOT=/usr/local/go
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