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20 Beginner golang interview questions and answers

What is Golang?

Golang, or Go, is an open-source programming language developed by Google. It is designed for simplicity, efficiency, and ease of use.

What are the key features of Golang?

Some key features of Golang include strong typing, garbage collection, concurrency support, efficient memory management, and a simple syntax.

How do you declare variables in Golang?

Variables in Golang can be declared using the var keyword followed by the variable name and its type, like var num int.

How do you handle errors in Golang?

In Golang, errors are handled using the error type. Functions often return an error as the last return value, which can be checked for nil to identify errors.

What is a Goroutine in Golang?

A Goroutine is a lightweight thread of execution in Golang. Goroutines allow concurrent execution of functions and are more efficient than traditional threads.

How do you write a for loop in Golang?

The for loop in Golang is written as for initialization; condition; post { // loop body }.

What is the difference between fmt.Println and fmt.Printf?

fmt.Println prints the output followed by a newline character, while fmt.Printf allows you to format the output using placeholders.

What are defer statements used for in Golang?

Defer statements in Golang are used to schedule a function call to be executed just before the surrounding function returns.

How do you handle concurrent programming in Golang?

Golang provides built-in support for concurrency through Goroutines and channels. Goroutines are used to execute functions concurrently, and channels are used for communication and synchronization between Goroutines.

What is a pointer in Golang?

A pointer in Golang holds the memory address of a value. It allows indirect access to the value, enabling more efficient memory management and the ability to modify values in place.

What is the difference between a slice and an array in Golang?

An array in Golang has a fixed length, whereas a slice is a dynamic, flexible view of an array. Slices can grow or shrink as needed.

How do you handle file operations in Golang?

Golang provides the os package for file operations. You can use functions like os.Open, os.Create, and os.ReadFile to work with files.

What is the difference between a method and a function in Golang?

A method is a function associated with a type and can be called using an instance of that type, while a function is not associated with any specific type.

33 What is the difference between a panic and an error in Golang?

A panic is a runtime error that typically indicates a severe issue, while an error is a recoverable issue that can be handled programmatically.

How do you create and use a struct in Golang?

A struct in Golang is created using the type keyword. You can define fields within the struct and access them using the dot notation.

What is a map in Golang?

A map in Golang is an unordered collection of key-value pairs. It provides fast lookup and insertion based on keys.

How do you handle JSON encoding and decoding in Golang?

Golang provides the encoding/json package for JSON encoding and decoding. You can use the json.Marshal and json.Unmarshal functions.

What is a package in Golang?

A package in Golang is a collection of related Go source files that are organized together. Packages provide encapsulation and modularity in Go programs.

How do you handle command-line arguments in Golang?

Command-line arguments can be accessed using the os.Args variable. It provides a slice of strings representing the command-line arguments.

How do you perform unit testing in Golang?

Golang has a built-in testing package called testing. You can write test functions with names starting with Test and use the go test command to run the tests.

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