9 Golang Interview Questions (With Sample Answers)
By Indeed Editorial Team
Published 28 September 2022
The Indeed Editorial Team comprises a diverse and talented team of writers, researchers and subject matter experts equipped with Indeed's data and insights to deliver useful tips to help guide your career journey.
Hiring managers who are interviewing candidates to fill computer programmer positions may ask specific questions about Golang. Questions you hear during an interview that relate to Golang may relate to the language's origins, benefits and functionality. Understanding how to answer Golang interview questions can help you show a hiring manager your knowledge and increase your chances of receiving a job offer.
In this article, we provide nine Golang interview questions and sample answers you can use to create your own responses.
9 Golang Interview Questions And Sample Answers
Here are nine Golang interview questions and sample answers for you to reference as you prepare for an upcoming job interview:
1. What is Golang?
A hiring manager may ask this question during an interview to determine if you have the minimum knowledge necessary to perform your expected duties. In your response, use clear language to offer a concise definition of this complex programming language. You may also describe its ease of use and its popularity among various types of organisations.
Example: "Golang, which some professionals refer to as just "Go," is a computer programming language invented by programmers at Google in 2009. It is an open-source language, which means that its code is freely accessible to the general public for modification and sharing. Many individuals, organisations and companies use Golang as their primary coding language due to its open-source nature."
2. What are packages in Golang?
Your response to this question can help an interviewer assess how well you understand this essential element of Golang. In your answer, you can provide a brief definition of packages in Golang. You may also explain that it is possible to store multiple packages within another package to further show your knowledge of this Golang component.
Example: "Packages in Golang, which programmers may refer to as "Go packages," are directories that store Go files. These Go files contain source code, so it is helpful for programmers to use Go packages to maintain records of Go files. Programmers store every piece of code, including functions and variables, in Go files. Then, they can transform these files into a single linked package. Within Golang, every source file resides in a package. It is also possible to place multiple packages inside a single larger package for easier organisation."
3. What is the purpose of a goroutine in Golang?
An interviewer may ask this question to gauge how well you understand Golang's ability to run multiple functions at once. In your response, you can state that a goroutine is a function that runs at the same time as other functions. You may also explain that a goroutine helps you attain concurrency when using Golang.
Example: "A goroutine is a function that runs at the same time as other functions. It is common to think of a goroutine as a lightweight thread that operates concurrently with other functions and has independent implementation. This element helps programmers attain concurrency when they are working with Golang. The Go runtime system is responsible for managing all goroutines."
4. Is Golang a case-sensitive programming language?
This interview question has a straightforward answer, but a hiring manager may ask it to ensure that you understand how to use it to write accurate code in Golang. In your answer, provide the direct answer of 'yes.' You may also offer additional details about capitalisation in Golang, like how capitalisation determines which packages to export.
Example: "Yes, Golang is a case-sensitive programming language. It is essential to write identifiers like function names, variables and language keywords with consistent capitalisation to produce the desired outputs. When you use Golang, capitalisation also determines which packages to export."
5. Can you return multiple values from a function in Golang?
A hiring manager may ask this question to assess how efficiently you can write code and produce outputs. They may want to know that you can return multiple variables so that you can maintain productivity in a fast-paced work environment. In your response, state that this situation is possible and briefly explain how to return multiple values from a function.
Example: "Yes, it is possible to return multiple values from a function in Golang. To produce multiple values, you can send multiple values with the return statement and separate them with a comma. You can also assign the return statement to multiple variables within a single statement. You may use the reverseValues function to return the values in reverse order or use a more traditional function."
6. Can you declare different variable types within a single line of code?
This is another interview question that a hiring manager may ask to test your efficiency at writing code in Golang. In your response, you can state that it is possible to declare different variable types within a single line of code. To enhance the quality of your answer, you may consider mentioning what different types of variables you can include within one line of code.
Example: "Yes, it is possible to declare different variable types within a single line of code. Computer programmers and other information technology professionals often do this to create their inputs more efficiently. For example, you can declare variables like a string, a floating-point integer and an integer number on a single line and return concise outputs with ease."
7. How does Golang work so fast?
A hiring manager may ask you about the design of Golang in addition to its functionality. They might ask you this question about Golang's speed or a similar inquiry to see if you understand how the language functions and how to use its various protocols and functions. When answering, explain the value of using Golang instead of other programming languages that may not function as quickly.
Example: "Golang is an incredibly fast performing language due to its design. Unlike some other programming languages, it has a small syntax and concurrency model, which helps make it more efficient. Golang's compilation system operates quickly and it has the ability to machine code, both of which expedite its pace. One of the most impactful speed-enhancing features of Golang is its storage arrangement. It hyperlinks all the dependency libraries into a single binary file. This reduces the language's reliance on servers, and it minimises the data lag you get from this reliance in some other languages."
8. If you want to grant concurrent data access, is it safer to do so via channels or maps?
Your response to this question can help a hiring manager learn how well you understand data security as it relates to Golang. In your response, state that channels provide more secure concurrent access. You can also explain what would happen if you attempt to grant concurrent data access with each method.
Example: "Granting concurrent data access is much safer via channels than it is with maps. Channels feature blocking and locking methods that prevent goroutines from sharing memory in the attendance of several threads. Maps do not come with locking methods, so they are not as safe as channels are. If you use maps, you need to implement direct locking methods to send data through goroutines without compromising data security."
9. What are the three components of a "slice" in Golang?
A hiring manager may use this question to gauge your understanding of a slice in Golang and how it differs from a type of array. In your answer, you can explain that a slice holds elements of the same type. You can also provide its three components, which are the pointer, length and capacity.
Example: "A slice in Golang is a type of data structure that varies in sequence length and holds elements of the same type. It references an adjacent array segment. Its three components are the pointer, length and capacity. The pointer refers to the first piece of an array that the slice can access. The length is the figure that sums the total elements within the slice. The capacity is by how much the slice is capable of expanding."
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