Top Golang Interview Questions and Responses to Help You Prepare for Your Next Job

Are you a Golang developer who is preparing for a technical interview? If so, you’ve come to the right place. We are offering an extensive selection of carefully curated Golang interview questions to aid you in achieving success during your interview and securing your dream job. Let’s get started! Golang is a widely used programming language adopted by major corporations such as Google, Uber, Twitch, Medium, and Sendgrid, among others. It is a powerful tool that offers an array of advantages, making it a desirable programming language for many businesses.

Could you please tell us more about Golang and your expertise with this programming language?

The Hiring Manager is interested in learning about your experience and familiarity with the programming language Golang. Please provide an overview of your years of experience with Golang, as well as a description of the tasks and projects you have completed using the language. Be sure to include details about your role within those projects.

How long have you been working with Golang? Other than Golang, what other technologies have you used?

You may indicate the amount of time you have been working with Golang both before and professionally. For example, if you have been practicing Golang for three years and have been using it professionally for four years, you can state that you have seven years of experience with it. Additionally, you should create a list of all the other programming languages you are familiar with and let the hiring manager know your level of proficiency in them.

Technical interview questions for Golang

How do you set up work environments and parameters?

Utilising JavaScript Object Notation (JSON) is a popular choice for configuring working environments and settings. The primary advantage of using JSON is that it is part of the standard library, which provides easy-to-use tools for writing data structures in a highly readable format. An alternative option is to employ the Go YAML package.

What exactly are Go Interfaces?

Answer: Go Interfaces are distinct from interfaces found in other programming languages. They provide a mechanism for describing a set of one or more method signatures. An interface is declared by using the keyword ‘type’, followed by a name and the keyword ‘interface’. The following outlines the interfaces available in Go:

  • A collection of techniques
  • Type

What exactly is syntax in the Golang programming language?

The Extended Backus-Naur Form (EBNF) is used to provide a precise specification of the syntax in the Go programming language. Examples of the syntax for various functions can be provided to illustrate the use of the EBNF.

  • [Expression] Production = production name “=”
  • Alternative = Expression Alternative “l”
  • Term Alternative = Term
  • Token [token “?”] Term = Production name L Option l Group l Repeat
  • “(” “Expression”) ” Group
  • “[” Expression “”] Option”
  • Expression “” Repetition = “”

In Go, how do you determine the type of an object?

The Golang programming language does not have the concept of a class type, therefore there are no objects in Go. Go supports a range of data types including int16, int32, int64, float64, text, bool and more. At runtime, there are three methods that can be used to identify the type of variable in Go:

  • Using fmt to describe a string type
  • Utilising the reflect Package
  • Making use of type assertions

May you list the functions that can halt or suspend the execution of a Go Routine that is already running?

To halt or suspend the execution of the current Go Routine, four functions are available:

  • runtime.Gosched: This is done automatically once the CPU core is released and added to the queue.
  • runtime.gopark: The Go Routine is stopped until the callback function unlock in the parameter list returns false.
  • runtime.notesleep: This function will put the thread to sleep.
  • runtime.Goexit: This will instantly halt the execution of goroutine and call defer, but it will not trigger panic.

How does GC operate in the Go programming language?

There are several ways for waste collecting. Go features a trash collector called Mark-and-Sweep. It operates in two stages:

  • Marking the RAM that the application is still using begins with the implementation of a Stop-the-World write barrier. This will allow the system to accurately determine the amount of memory allocated during the Mark phase. Following that, all RAM that the application is still utilising must be marked. Once the marking is complete, the write barrier can be removed.
  • Sweep is the second step, which occurs following fresh allocations.

In Go, what is an idiomatic manner of encoding enums?

The Go programming language does not provide an explicit enumerated type; however, it can be implemented by utilising constants and the iota keyword. There are a few techniques that can be used to achieve this, such as:

  • By introducing a new integer type
  • By listing its iota value
  • By assigning a String function to the type

What are the applications of tags in the Golang programming language?

The primary purpose of field tags is to attach meta-information to a field that can be obtained through reflection. Field tags are often used to describe how a struct field is stored or retrieved from a database, but can also be used to include any type of meta-information for either external or internal use. Generally, a tag string’s value is composed of a series of key-value pairs separated by spaces.

In Golang, how do you compare two interfaces?

In Golang, you may compare two supplied interfaces if and only if:

  • The interface value is either nil or
  • The fundamental type is same and similar. The underlying value must be the same as well.

To compare two interface variables, use the == or!= operators.

What is the Map Project’s malloc threshold, and how can you change it?

The Map Project’s memory allocation threshold is set to 128 bytes by default. It is possible to modify this setting at run-time by adjusting the values of maxKeySize and maxValueSize within the hashmap data structure.

When does the Go Runtime allocate heap memory and when does it allocate stack memory?

During the execution of a program, memory is allocated from the Heap. The Heap is a pool of memory that can be requested and released by a programmer as needed. It is a collection of memory space that can be used to store data and variables, allowing for quick and easy access. The Heap is a critical component of any program, as it enables the efficient management of memory resources.

Stack is a memory allocation technique that is employed on a temporary basis. Data members are only available while the associated method is being executed, and when the method is complete, the memory is automatically released. If the amount of memory allocated to the stack is exceeded, the Java Virtual Machine (JVM) will throw a StackOverflowError.

Coding interview questions for Golang

How can two structures be compared? Please provide an example.

In order to compare two structures, it is necessary to utilise the ‘==’ operator. It is essential to ensure that neither of the structures contain slices, maps, or functions, as the code will not be compliant if this is the case. For example:

A int type Foo struct

The B string

The C interface

a:= FooA:1, B:”one,” C:”two”

b:= FooA:1, B:”one,” C:”two”

(a == b) println

/ Result: true

A []int type Bar struct

a: = BarA: []int1; b: = BarA: []int1

(a == b) println

/ Output: a == b is an invalid operation (struct containing []int cannot be compared)

If the underlying data types of two interfaces are “simple” and identical, then it is possible to compare them using the “==” operator. However, if the data types are not the same, attempting to do so may cause the code to panic or crash during execution.

variable an interface; variable b interface

a = 10; b = 10

(a == b) println

/ Result: true

[]int1 = a; []int2 = b

What is the Go equivalent of the ternary operator in C? Use an example to demonstrate.

In Go, there is no direct counterpart of C’s ternary operator. Instead, use an if-else block. As an example:

main package

importing (

“fmt”

)

main() function

var x, y, int result

x = 5

y = 10

if x > y {

x = outcome

} else {

y = outcome

}

fmt.Println(result)

}

Result: 10

In Golang, how can you tell whether two slices are equal?

It is essential to use a loop to thoroughly test each element in the slice; the equality of the slice is not predetermined. There is, however, a byte that should be taken into consideration. If you are comparing values of type []byte, you must use the equal function to get accurate results.

bool func testEq(a, b []Type)

if len(a)!= len(b), then

return a negative value

}

if i:= range a

if a[i]!= b[i], then

return a negative value

}

}

returning true

}

Can I obtain a good job using Golang?

Are you looking to become part of the one percent of software developers in our expansive talent pool of over 1.5 million? If you have the necessary skills and are familiar with the Golang programming language, then Works can help you find high-paying and high-growth roles with some of the most prominent US organisations. Visit our Apply for Jobs page to get started!

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