Code360 powered by Coding Ninjas X Naukri.com. Code360 powered by Coding Ninjas X Naukri.com
Table of contents
1.
Introduction
2.
Golang Interview Questions for Freshers
2.1.
1. What is GoLang?
2.2.
2. Mention a few benefits of GoLang over other programming languages.
2.3.
3. What data types does GoLang offers?
2.4.
4. How will you describe the scope of variables in GoLang?
2.5.
5. Write the output of the following code.
2.6.
6. Is GoLang a case-sensitive language?
2.7.
7. Can you declare variables of different types in a single line of GoLang code?
2.8.
8. Suppose that you have developed a GoLang program on Windows. Now you want to compile that program on any other operating system. Will it run?
2.9.
9. Is it possible to change any particular character in a String of a GoLang program?
2.10.
10. Write the output of the following GoLang code.
2.11.
11. Give the value of slice_example of the below code.
2.12.
12. How arrays in GoLang are different from other programming languages?
2.13.
13. What is GoLang Workspace?
2.14.
14. Are packages in GoLang same as other languages? Please explain.
2.15.
15.  Briefly explain Goroutines.
3.
Golang Interview Questions for Experienced
3.1.
16. How does ‘Slice’ work in GoLang?
3.2.
17. Explain various aspects of Go Interfaces.
3.3.
18. Give the syntax of the ‘for’ loop in GoLang?
3.4.
19. Describe the CGo keyword in GoLang.
3.5.
20. Which data type would you use for concurrent data access? Why?
3.6.
21. How would you explain GoLang Methods?
3.7.
22. Explain GoLang pointers in detail. Give its advantages.
3.8.
23. Write a GoLang code to compare two slices.
3.9.
24. Explain Shadowing using an example.
3.10.
25. Write a GoLang program to print the xth Fibonacci series.
3.11.
26. How do you copy the value of the Map variable in GoLang?
3.12.
27. Give a function that reverses a slice of integers.
3.13.
28. What is constants? Explain its types.
3.14.
29. Do you have the option to return multiple values from a function in GoLang?
3.15.
30. How are errors handled in GoLang?
3.16.
31. How will you copy the values of a slice in GoLang?
4.
Frequently Asked Questions
4.1.
How do I prepare for a Golang interview?
4.2.
What is Golang used for?
4.3.
What are the several built in support in go?
4.4.
Why is go often called a post oop language?
5.
Conclusion
Last Updated: Mar 27, 2024
Hard

Top 30 Golang Interview Questions (2024)

Author Rupal Saluja
0 upvote
Master Power BI using Netflix Data
Speaker
Ashwin Goyal
Product @
18 Jun, 2024 @ 01:30 PM

Introduction

As technology continues to evolve, so does the demand for skilled professionals in the programming realm. In the dynamic world of software development, staying abreast of the latest tools and languages is paramount, and one language that has steadily risen to prominence is Golang, also known as Go. Developed by Google, Golang has gained traction for its simplicity, efficiency, and concurrency support.

This quick guide on Golang Interview Questions will help a lot if you prepare for an interview regarding the same in the future. You will receive brief overviews and appropriate responses of a few Golang Interview Questions through this article.

This article will give you brief overviews and appropriate responses to a few Golang Interview Questions.


Click on the following link to read further: Java OOPs Interview Questions and Operating System Interview Questions

Golang Interview Questions for Freshers

You will get two sets of Golang Interview Questions in this blog- Fresher and Experienced.

1. What is GoLang?

GoLang is an open-source programming language. Google launched it to help create dependable and systematic software. It is comparatively simple when compared to a few existing programming languages. It is a fast-growing enterprise programming language with immense career opportunities.
You can get an efficient performance like C and C++, good concurrency handling like Java, and a fun coding experience like Python in only one programming language- GoLang. To know more about GoLang, you can refer to our blogs in Coding Ninjas Studio.

2. Mention a few benefits of GoLang over other programming languages.

A few benefits of GoLang over other programming languages are listed below.

  • Every syntax and feature is designed to make the programmer's life easier. It was not an academic experiment.
  • GoLang is more readable because of its standard code format.
  • It has more efficient automatic garbage collection than other programming languages.
  • GoLang is optimally designed for concurrent programming and scales well.

 

3. What data types does GoLang offers?

Datatypes offered by GoLang are Boolean, Method, Numeric, Array, String, Slice, Struct, Map, Channel, Interface, Function, and Pointer.
 

4. How will you describe the scope of variables in GoLang?

The scope of any variable is defined as the part of the code where that variable is accessible. Every variable’s scope is identified at the compile time.

There are two types of variable scopes:

  • Local Variables
  • Global Variables
     

5. Write the output of the following code.

package main
import “fmt”
const(
         a = 1
         b
         c
)
func main(){
     fmt.Println(a, b, c)
}


Output:

111


6. Is GoLang a case-sensitive language?

Yes, GoLang is a case-sensitive programming language.


7. Can you declare variables of different types in a single line of GoLang code?

Yes, you can declare variables of different types in a single line of GoLang code.

You can use the below example for your reference.

var x, y, z= 9.6, 10, “codingninjas”


8. Suppose that you have developed a GoLang program on Windows. Now you want to compile that program on any other operating system. Will it run?

It is possible to compile and run an already-developed GoLang program in any other operating system without difficulty.


9. Is it possible to change any particular character in a String of a GoLang program?

It is impossible to change any particular character in a String of a GoLang program. This is because the strings are immutable data types. If you try to alter any specific character in a String, you will get a runtime error.


10. Write the output of the following GoLang code.

package main
import “fmt”
func main(){
     x := []int{2, 4, 6, 8, 10}
     x = append(x, 12)
     fmt.Println(len(x))
}


Output:

6


11. Give the value of slice_example of the below code.

OddNums := [8]{1, 3, 5, 7, 9, 11, 13, 15}
slice_example := OddNums[2:6]


Output:

5 7 9 11

12. How arrays in GoLang are different from other programming languages?

Arrays in GoLang are different from other languages in the following ways.

  • In GoLang, the size of an array influences the type of Array, unlike other languages. For example, [5]int and [7]int are not identical arrays.
  • You will get a copy of the array if you pass an array to a function. In other languages, you get a pointer to that array.


13. What is GoLang Workspace?

The GoLang Workspace involves the following three root directories, which play an important role in the successful execution of any program.

  • The Src directory

It is the source file contained in the packages.

  • The Pkg directory

It contains the package objects that are stored in the directory.

  • The Bin directory

It consists of all the executable commands of the directory.

14. Are packages in GoLang same as other languages? Please explain.

Yes, packages in GoLang are similar to packages in other languages.

Go packages are directories in the Go workspace comprising Go sources or other packages. Every GoLang code is saved and stored in a linked package. This makes it compulsory for a source file to belong to a package.

The package is declared at the start of the Go source file with the syntax-

package package_name

 

For Example,

package Main


15.  Briefly explain Goroutines.

Goroutine can be a function or method that runs parallel or concurrently with other functions. It is a lighter version of a thread, so the cost of creating it is also less. It has independent execution and can be managed entirely by Go Runtime. 

The main function of the main package is the primary goroutine. You can start with a goroutine by mentioning the ‘go’ keyword before any method call.

For Example,

go example_routine()
Get the tech career you deserve, faster!
Connect with our expert counsellors to understand how to hack your way to success
User rating 4.7/5
1:1 doubt support
95% placement record
Akash Pal
Senior Software Engineer
326% Hike After Job Bootcamp
Himanshu Gusain
Programmer Analyst
32 LPA After Job Bootcamp
After Job
Bootcamp

Golang Interview Questions for Experienced

16. How does ‘Slice’ work in GoLang?

Slice is one data type in GoLang. It is a simple and lightweight data structure used for storing homogeneous data of variable length. There are three components of Slice:

  • Pointer

It points to the first element of the array accessible using Slice.

  • Length

It is the count of the total number of elements in the slice. Length can be equal to or less than the capacity.

  • Capacity

It gives the maximum number of elements present in a Slice. It can be equal to or more than the capacity.


17. Explain various aspects of Go Interfaces.

Go Interfaces are a little different from other languages’ interfaces. They have a pre-defined set of method signatures. They are abstract; therefore, we cannot find an instance of any of them.

An interface acts as two things:

  • Custom Types
  • Collection of Method Signatures

 

18. Give the syntax of the ‘for’ loop in GoLang?

The syntax of the ‘for’ loop in GoLang is given below.

for [condition | (init; condition; increment) | Range]
{
     statements;
}


For Example,

package main
import “fmt”
func main(){
     for i := 2; i <= 10; i+=2 {
          fmt.Print(i)
     }
}

 

Output:

1 2 3 4 5 6 7 8 9 10


19. Describe the CGo keyword in GoLang.

The CGo keyword of GoLang permits Go packages to invite C code. Suppose you have a C file with really impressive and unique features. You want to use this file in your Go code. So, CGo allows you to merge C and Go files into a new Go package. 

20. Which data type would you use for concurrent data access? Why?

Channels are considered safer for concurrent data access. This is because they have a blocking and locking mechanism that doesn’t permit the goroutine to share its memory. In the presence of several threads, its blocking and locking mechanism becomes even more robust.

21. How would you explain GoLang Methods?

We already know that GoLang works with methods but not classes. These methods are similar to the functions in other languages. The difference is that the Go Methods contain a receiver argument. The GoLang methods also determine the properties of the receiver.

GoLang Methods are also known as receiver functions. These methods present a real-world and better concept.

22. Explain GoLang pointers in detail. Give its advantages.

Go Pointers are special variables used to store addresses of other variables. There are two types of operators that Pointer supports.

  • * operator

The dereferencing or * operator is used to access the address’s value of the variable stored in the pointer.

  • & operator

The address or & operator is used to return the address’s value of the variable stored in the pointer.

Some of its advantages are listed below.

  • Increases the edge cases’ success rate.
  • Permits functions to directly mutate the passed values.
  • Helps mention the lack of values.

 

23. Write a GoLang code to compare two slices.

The GoLang code to compare the two slices is given below.

package main
import 
(
"bytes"
"fmt"
)

func main(){
    x1 := []byte{'C', 'O', 'D', 'I', 'N', 'G'}
    x2 := []byte{'N', 'I', 'N', 'J', 'A', 'S'}
    output := bytes.Compare(x1, x2)
    if output == 0 {
        fmt.Println("Equal")
    }
    else {
        fmt.Println("Not Equal")
    }
}


Output:
Not Equal

24. Explain Shadowing using an example.

Shadowing is when a variable overrides another variable in a particular scope. This situation usually occurs when a variable with the same name and data type is declared in an inner and outer scope.

You can use the example below for your reference.

var brands = 2
type chocolate struct{
    name string
    flavor string
}
chocolates := [{
                  name : “DairyMilk”,
                  flavor : “Oreo”
               },
               {
                  name : “DairyMilk”,
                  flavor : “RedVelvet”
               }]
func countchocolate(){
      for i := 0; i < brands; i++{
            if chocolate[i].flavour == “Oreo” {
                  brands += 1
                  fmt.Println(brands)
        }
    }
} 

 

In this example variable ‘name’ in the outer scope shadows the variable ‘name’ in the inner scope.

25. Write a GoLang program to print the xth Fibonacci series.

Use the following GoLang code to print the xth Fibonacci series.

package main
import "fmt"
func Fib(x int) int {
        if x < 2 {
            return x
        }
        return Fib(x-1) + Fib(x-2)
}
func main() {
    fmt.Println(Fib(10))
}

 

Output:

55


26. How do you copy the value of the Map variable in GoLang?

You can copy the values of a Map variable in GoLang by traversing its keys. The simplest way to copy a map in GoLang is given below.

x := map[string]int{“A” : 1, “B” : 2}
y := make(map[string]int)
for key, value := range a{
      b[key] = value
}


27. Give a function that reverses a slice of integers.

Use the GoLang function code to reverse a slice of integers.

func reverse(sl []int){
    for x, y := 0, len(sl)-1; x < y; x, y = x+1, y+1{
            sl[x], sl[y] = sl[y], sl[x]
    }
}
func main(){
      i := []int{10, 20, 30, 40, 50}
      reverse(i)
      fmt.Println(i)
}


Output:

50 40 30 20 10


28. What is constants? Explain its types.

By their name, it is somewhere clear that constants are some constant values given to a variable. These variables do not change their values in a defined scope. There are two types of constants.

  • Untyped Constants

A constant is said to be untyped till it is given a type ‘typed’ explicitly. to avoid GoLang’s strong type system temporarily.

For Example,

const x=0
var myFloat32 f=7.5

 

  • Typed Constants

A constant is said to be typed when you mention the keyword ‘typed’ along with the variable. That is, you declare its type explicitly. This type strips off the flexibility that comes with untyped constants.

const typedInt x=0


29. Do you have the option to return multiple values from a function in GoLang?

Yes, a developer can return multiple values from any GoLang function. You must use comma-separated values with the return statement and assign them to multiple variables.

Use the following GoLang code for your reference.

package main
import (
      “fmt”
)
func reverseV(x,y string)(string, string){
      return y,x
}
func main(){
      v1, v2 := reverseV(“coding”,”ninjas”)
      fmt.Println(v1,v2)
}


Output:

ninjas coding


30. How are errors handled in GoLang?

In GoLang, errors are any interface type implementing the Error() method. Here, you do not have try or catch methods as in other languages. Errors are returned as normal values. 

The syntax to create an error interface is given below.

type name interface{
      Error() int
}

 

31. How will you copy the values of a slice in GoLang?

Copying a slice in GoLang is very easy. You can use the built-in method ‘copy()’.

Use the example below for your reference.

s1 := []int{10, 20, 30}
s2 := []int{40, 50, 60}
s3 := s1
copy(s1, s2)
fmt.Println(s1, s2, s3)


Output:

[40 50 60] [40 50 60] [40 50 60]

Frequently Asked Questions

How do I prepare for a Golang interview?

You start preparing for a Golang interview by mastering the core concepts, practice coding challenges, understand concurrency, and be familiar with common libraries. Explore real-world Golang projects to enhance practical knowledge.

What is Golang used for?

Golang is used for building scalable, concurrent systems. It's efficient for web development, networking tools, distributed systems, and cloud-based applications due to its simplicity and performance.

What are the several built in support in go?

Go boasts built-in support for concurrency with goroutines and channels, efficient garbage collection, a robust standard library, and features like slices and maps for streamlined data manipulation.

Why is go often called a post oop language?

Go is considered post-OOP because it minimizes reliance on classical object-oriented programming (OOP) principles, favoring composition over inheritance and emphasizing simplicity and efficiency in code design.

Conclusion

We hope you have gained insights on Golang Interview Questions through this article. This will help you excel in your interviews and enhance your knowledge of Golang. These Golang Interview Questions and answers suit freshers and experienced candidates.

This set of Golang interview questions will help you in interviews and increase your understanding of the same.

Here are some of the interview questions on some of the famous topics:

  1. SQL Query Interview Questions
  2.  SAP FICO Interview Questions 
  3. Html interview questions
  4. C++ Interview Questions
  5. Excel Interview Questions
  6. MVC Interview Questions


For peeps who want to grasp more knowledge other than Golang Interview Questions, that is, DBMSOperating SystemSystem Design, and DSA, refer to the respective links. Make sure that you enroll in the courses we provide, take mock tests, solve problems available, and interview puzzles. Also, you can pay attention to interview stuff- interview experiences and an interview bundle for placement preparations. Do upvote our blog to help other ninjas grow.

Happy Coding!

Live masterclass