Cognizant Golang Developer Interview Questions and Answers

Asked mostly on grpc.
Couple of coding questions like write the protobuf file for interfaces and gave a string from which asked to find out the valid IP address in that string.

Golang Basics, DBMS, Channels, Unit Test

1) Search an array element
2) braces balance program
3) anagrams Program

Q1. What is map and how it i useful
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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. Reverse a string
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Ask to write a program for find prime number of n numbers using gorountines

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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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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