Golang Interview Questions
Outline
This comprehensive guide has three sets of important golang questions and answers: Beginners, Intermediate and Advanced.
Read, learn, practice and prepare yourself with these sure-shot golang interview questions to crack your next interview for a golang developer job.
We have compiled the top golang interview questions and answers for you to prepare for your next interview. We have divided the questions into three categories based on experience.
We have selected the most asked Golang questions in any interview. Each of these questions represents some core insights on the Golang programming language.
But first let’s discuss – Why is Golang one of the top programming languages? Why is there high demand for Golang developers? What makes Golang development a competitive job?
Google created Golang as an open-source programming language in 2007. Sometimes it is referred to as Go. It was intended to take the place of the more widely used, high-performance server-side languages, such as Java. Golang was first created for infrastructure and networking-related applications, but it is currently utilised for a wide range of applications, including server and cloud-based ones. This programming language is becoming more popular in the computer industry thanks to the use of major firms like Meta, Apple, BBC, and Google.
A professional developer who is familiar with one or more programming languages can learn Golang. Developers frequently learn Go after becoming experts in Python, PHP, and C++. Some programmers manage to pick up both Python and Go, or PHP and Go, over time. If you go through job postings, you’ll frequently find combinations of Python/Golang, PHP/Golang, and other languages in the requirements.
The above statements prove that Golang is indeed one of the most sought-after programming languages.
Now, let’s learn top interview questions on Golang. Let’s start.
Golang Interview Questions for Beginners
1. Explain Goroutines?
We can say that Goroutines methods or functions that run on toher methods or functions concurrently. They can also be called lightweight threads. When compared to threads, Goroutines are even less expensive to create. If you want to stop goroutines, you must supply the goroutine a signal channel that pushes a value into goroutine to terminate.
2. Can Go return multiple values from a function?
Yes, a Go function can return multiple values.
Consider the following function:
3. Explain the packages in Golang?
Like most programming languages, Go also runs on packages. Like any other programming language, a Go programme starts with the “main” package, and then additional packages like “fmt” and “math/rand” are imported by using the “import” keyword.
4. Describe the pointers in GoLang?
Pointers are nothing but a kind of variable that holds the address of other variables. In Golang, the pointers are called special variables. In Golang pointers, there are two operators:
* operator (Dereferencing Operator): It is used to access the value in the address. & operator (address operator): This operator is used to return the address of the variable.
* operator (Dereferencing Operator): It is used to access the value in the address. & operator (address operator): This operator is used to return the address of the variable.
5. How to declare a constant variable in Go?
6. Define Methods in Golang?
The major difference between a Go Method and a Go Function is that a Go Method contains Receiver Argument. The Method can also obtain the characteristics of the receiver by cooperating with the receiver argument.
The syntax is –
The syntax is –
7. Name some built-in supports in Golang?
Sometimes we developers also need support while programming. Go provides some of them. Some built-in supports of Golang are
Web server: http/net
Container: heap/container list/ container
Cryptography: crypto md5/ crypto
Database: sql/database
Compression: gzip/compress
8. Explain ‘slice’ in Golang?
Slice is a lightweight data structure. It is very easy to use. It is more convenient than using an array. A slice is a sequence of variable-length sequences for storing homogeneous types of data.
There are three components in a slice –
Pointers: This is used for pointing to the array’s first element which is accessible using slice. Lengths: This represents the total count of elements present in the slice. Capacity: This is used for representing the capacity up to which the slice can expand.
For example: Let’s consider arr, an array with the values “This”,“is”, “a”,“Go”,“interview”,“question”.
In the above program, we tried to slice the array to get the first 3 words starting from the word at the index position of the original array. Then the program is trying to find the length and capacity of the slice. In that way, the output of the above program is –
There are three components in a slice –
Pointers: This is used for pointing to the array’s first element which is accessible using slice. Lengths: This represents the total count of elements present in the slice. Capacity: This is used for representing the capacity up to which the slice can expand.
For example: Let’s consider arr, an array with the values “This”,“is”, “a”,“Go”,“interview”,“question”.
In the above program, we tried to slice the array to get the first 3 words starting from the word at the index position of the original array. Then the program is trying to find the length and capacity of the slice. In that way, the output of the above program is –
9. Why do you think Golang is fast while comparing it with other programming languages?
Golang’s memory management and concurrency architecture are straightforward and effective, making it faster than other programming languages. Compilation of Go code to machine code happens quickly and effectively. Furthermore, the dependencies are connected to a single binary file, eliminating server dependencies.
10. Do you think Golang supports inheritance?
No, I don’t think so, Golang doesn’t allow the use of the inheritance concept. In other cases, to support code reuse and polymorphism functionality in Go, it provides a composition of embedding, and interfaces.
Intermediate Golang Interview Questions
As a Golang developer, with experience you will be able to answer Golang interview questions for freshers with much ease. In this section we have collected some Golang tricky interview questions for you. This section will help you with the exact kind of Intermediate Golang Interview Questions that you may face in your job hunt.
1. How do you determine a variable's type in Go at runtime?
For validating the variable type at runtime in Go, we can use a specific form of switch. A “type switch” is the name given to this switch expression.
Take a look at the code below, where we are testing the type of the variable v and carrying out a number of operations.
The code above checks the type of the variable v; if it is uint64, it prints “Integer type.” otherwise, it does not. The code prints “String type” if the variable’s type is a string. The default block is performed and its statements are run if the type is not the same.
The code above checks the type of the variable v; if it is uint64, it prints “Integer type.” otherwise, it does not. The code prints “String type” if the variable’s type is a string. The default block is performed and its statements are run if the type is not the same.
2. Do you recommend usage of Global Variables in programs implementing goroutines?
Since global variables can be accessed and changed by numerous goroutines at once, using them in goroutines is not advised. This might produce arbitrary and unforeseen outcomes.
3. How is GoPATH different from GoROOT variables?
The GoPATH is a variable environment symbolizing the directories of $GoROOT which contains the source and the binaries of Go Projects. The Go SDK’s location is determined by the GoROOT variable. Unless we intend to utilize several Go versions, we don’t need to alter the variable. While the GoROOT identifies the location of the Go SDK, the GoPATH identifies the workspace’s root.
4. What is the safer way for concurrent data access? Channels or Maps?
Because channels include blocking/locking techniques that prevent goroutines from sharing memory while there are several threads active, they are secure for concurrent access.
Maps lack locking features, making them hazardous. In order to communicate data securely over goroutines, we must utilise explicit locking techniques like mutex when utilising maps.
5. Describe a switch statement in Golang?
A switch statement can also be said as a multi-way branch record. It provides a smooth way to assign the execution to different parts of code based upon the utility of the expression.
Go has two types of switch statements they are –
Expression switch:Expression switch in Go is equivalent to the switch statement in C, C++, and Java. It provides an easy way to route execution to different areas of code based on the phrase’s value.
Type switch:This type switch is utilized when one requires to match types. In this switch, the case includes the type which is operating to compare with the type existing in the switch expression.
Advanced Golang Interview Questions
With practice, you will be able to respond to basic Cryptocurrency interview questions with ease as a developer.
We have gathered some challenging Cryptocurrency interview questions for you in this part. You can get assistance from this section with these precise types of intermediate Cryptocurrency interview questions you might face while looking for work.
11. What Is a Consensus Algorithm?
The consensus algorithm is a technique for reaching agreement on a data modification across a system or distributed network. Blockchains make extensive use of consensus algorithms because they allow the network of unidentified nodes to come to an agreement on the data that is being stored or exchanged over the blockchain. The Proof-of-Stake (PoS) and Proof-of-Work consensus algorithms are two of the most widely used ones (PoW).
12. What Kinds of Consensus Algorithms Are There?
There are many different consensus algorithms and methods available. The most often used consensus algorithm consists of
– Proof-of-Work (PoW)– Proof-of-Stake (PoS)
– Proof-of-Authority (PoA)
– Byzantine Fault Tolerance
– Proof-of-Elapsed Time (PoET)
– Delegated Proof-of-Stake (DPoS)
13. The Proof-Of-Work (Pow) Consensus Algorithm: How Does It Operate?
Proof-of-Work (PoW) asks nodes to provide the necessary computing power as proof of their work so that complex mathematical puzzles are solved. The blocks in which the transactions are kept influence the difficulty of mining for miners based on the block difficulty. The unique nodes that contribute to giving the blockchain processing power are known as miners. And the process is called Mining.
14. The Proof-Of-Stake (Pos) Consensus Algorithm: How Does It Operate?
Proof-of-Stake functions using token staking. It means that tokens or coins are staked on nodes rather than completing mathematical computational challenges. By receiving stake from a user, these unique nodes participate in the consensus procedure. Every node has a chance to be selected to validate a transaction block. Once they successfully validate transactions, they receive a reward.
15. Explain Cryptocurrency Mining?
The process of verifying transactions on a blockchain and making sure they are put in a block is known as cryptocurrency mining. Miners work to provide consensus to a blockchain by using expensive computing machinery. The Proof-of-Work (PoW) consensus mechanism primarily uses mining, which requires the miner to solve challenging mathematical puzzles. They receive payment for their labour.
16. What is DeFi Technology?
Decentralized finance is a new kind of decentralised monetary system that operates on open-source blockchains like Ethereum. Decentralized finance often consists of digital assets, protocols, smart contracts, and dApps.
17. What Is Hyperledger?
A cooperative open-source project called Hyperledger aims to make blockchain better. It provides a structure made for businesses. The tools will support stronger blockchain adoption in a variety of industries, including as manufacturing, supply chains, banking, etc. It is run by the Linux Foundation. You could also be asked about Hyperledger Fabric and Hyperledger Sawtooth in an interview. To ace the interview questions, look at Fabric and Hyperledger Sawtooth.
18. What Is Smart Contract?
The easiest way to describe a smart contract is as computer code that enables the enforcement of rules and guidelines between two parties that will interact to carry out an agreement. Once drafted, the agreement can be automatically performed as many times as necessary. A legal contract known as a “smart contract” is created using computer code. It is frequently used in blockchain technology to automate processes and increase system transparency. Smart contracts, for instance, may be used to buy, sell, or possess physical assets.
Advanced Cryptocurrency interview questions
This section contains some advanced interview questions on Golang. This section also explores a few Golang coding Interview questions. You may practice the common python programs which the interviewer often asks.
1. Write a Go program to swap variables in a list?
Let’s consider we have num1=2, num2=3. To swap these two numbers, we can just write: num1,num2 = num2, num1
The same logic can be applied to a list of variables as shown below:
The output of the above program is –
The same logic can be applied to a list of variables as shown below:
The output of the above program is –
2. Write a GO Program to find factorial of a given number.
Factorial of a number is the product of multiplication of a number n with every preceding number till it reaches 1. Factorial of 0 is 1.
3. Write a Go program to find the nth Fibonacci number.
4. Write a Golang code for checking if the given characters are present in a string.
5. Write a Go code to compare two slices of a byte.
In Blockchain, mining is a process to validate transactions by solving a difficult mathematical puzzle called proof of work. Now, proof of work is the process to determine a number (nonce) along with a cryptographic hash algorithm to produce a hash value lower than a predefined target. The nonce is a random value that is used to vary the value of hash so that the final hash value meets the hash conditions.
Conclusion
Whether you’re a developer getting ready for an interview or a hiring manager trying to find the ideal candidate, we believe these cryptocurrency interview questions and answers will be a tremendous help to you during the process.
Keep in mind that technical proficiency is only one aspect of the hiring process. Both prior experience and soft skills are essential if you want to be hired for a high-paid crypto development position.
Keep in mind that many of the Cryptocurrency interview questions are open-ended. Not just the answer you memorised, but also your reasoning will be of interest to the interviewer. Always be prepared to address any follow-up inquiries about how you came to your conclusion. Describe the way you think.
Good Luck! Regarding your future AI interview. You can browse through our listings for cryptocurrency developer jobs here.
