Home Interview Questions Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019

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Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019

Top 35+ Go Language (Golang) Interview Question And Answers PDF: Here are the top interview questions of Golang. Be prepared for the interview. You can download the entire questions in a pdf format. so guys All the best for your interview.

1) What is Go programming language?

GO is an open source programming language developed at Google. It is also known as Golang. This language is designed primarily for system programming.


2) Why should one use Go programming language?

Because Go is an open source programming language so, it is very easy to build simple, reliable and efficient software.


3) Who is known as the father of Go programming language?

Go programming language is designed by Robert Griesemer, Rob Pike, and Ken Thompson. It is developed at Google Inc. in 2009.


4) What are packages in Go program?

Go programs are made up of packages. The program starts running in package main. This program is using the packages with import paths “fmt” and “math/rand”.


5) Does Go support generic programming?

Go programming language doesn’t provide support for generic programming.

6) Does Go support operator overloading?

No support for operator overloading.

7) Does Go support method overloading?

No support for method overloading.

8) Does Go support pointer arithmetics?

No support for pointer arithmetic.

9) Does Go support generic programming?

No support for generic programming.

10) Is Go a case sensitive language?

Yes! Go is a case sensitive programming language.

11) What is a nil Pointers in Go?

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019:Go compiler assign a Nil value to a pointer variable in case you do not have exact address to be assigned. This is done at the time of variable declaration. A pointer that is assigned nil is called a nil pointer. The nil pointer is a constant with a value of zero defined in several standard libraries.

12) What is a string literal in Go programming?

A string literals specifies a string constant that is obtained from concatenating a sequence of characters.
There are two types of string literals:

  • Raw string literals: The value of raw string literals are character sequence between back quotes “. Its value is specified as a string literal that composed of the uninterrupted character between quotes.
  • Interpreted string literals: It is shown between double quotes ” “. The value of the literal is specified as text between the double quotes which may not contain newlines.

13) What is workspace in Go?

A workspace contains Go code. A workspace is a directory hierarchy with three directories at its root.

  • “src” directory contains GO source files organized into packages.
  • “pkg” directory contains package objects.
  • “bin” directory contains executable commands

14) Why goroutines instead of threads?

Goroutines are part of making concurrency easy to use. The idea, which has been around for a while, is to multiplex independently executing functions—coroutines—onto a set of threads. When a coroutine blocks, such as by calling a blocking system call, the run-time automatically moves other coroutines on the same operating system thread to a different, runnable thread so they won’t be blocked. The programmer sees none of this, which is the point. The result, which we call goroutines, can be very cheap: they have little overhead beyond the memory for the stack, which is just a few kilobytes.
To make the stacks small, Go’s run-time uses resizable, bounded stacks. A newly minted goroutine is given a few kilobytes, which is almost always enough. When it isn’t, the run-time grows (and shrinks) the memory for storing the stack automatically, allowing many goroutines to live in a modest amount of memory.

15) What is structure in Go?

Structure is another user defined data type available in Go programming, which allows you to combine data items of different kinds.

16) What is the usage of continue statement in Go programming language?

The continue statement facilitates the loop to skip the remainder of its body and immediately retest its condition prior to reiterating.


17) What is the usage of goto statement in Go programming language?

The goto statement is used to transfer control to the labeled statement.


18) Explain the syntax for ‘for’ loop.

The syntax of a for loop in Go programming language is:

  1. for [condition |  ( init; condition; increment ) | Range]  
  2. {  
  3.    statement(s);  
  4. }  

19) Write the syntax to create a function in Go programming language?

Syntax to create a function in Go:

  1. func function_name( [parameter list] ) [return_types]  
  2. {  
  3.    body of the function  
  4. }   

20) Explain static type declaration of variable in Go programming language?

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019: Static type variable declaration is used to provide assurance to the compiler that there is one variable in the given type and name so that there is no need for compiler to know complete detail about the variable for further processing. A variable declaration has its meaning at the time of compilation only, compiler needs actual variable declaration at the time of linking of the program.

21) In how many ways you can pass parameters to a method?

While calling a function, there are two ways that arguments can be passed to a function −
Call by value − This method copies the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument.
Call by reference − This method copies the address of an argument into the formal parameter. Inside the function, the address is used to access the actual argument used in the call. This means that changes made to the parameter affect the argument.

22) What’s the difference between new and make?

In short: new allocates memory, make initializes the slice, map, and channel types.

23) What is the size of an int on a 64 bit machine?

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019:The sizes of int and uint are implementation-specific but the same as each other on a given platform. For portability, code that relies on a particular size of value should use an explicitly sized type, like int64. Prior to Go 1.1, the 64-bit Go compilers (both gc and gccgo) used a 32-bit representation for int. As of Go 1.1 they use a 64-bit representation.
On the other hand, floating-point scalars and complex types are always sized (there are no float or complexbasic types), because programmers should be aware of precision when using floating-point numbers. The default type used for an (untyped) floating-point constant is float64. Thus foo := 3.0 declares a variable foo of type float64. For a float32 variable initialized by an (untyped) constant, the variable type must be specified explicitly in the variable declaration:

var foo float32 = 3.0

Alternatively, the constant must be given a type with a conversion as in foo := float32(3.0).

24) Why does my Go process use so much virtual memory?

The Go memory allocator reserves a large region of virtual memory as an arena for allocations. This virtual memory is local to the specific Go process; the reservation does not deprive other processes of memory.
To find the amount of actual memory allocated to a Go process, use the Unix top command and consult the RES(Linux) or RSIZE (Mac OS X) columns.

25) Why are ++ and -- statements and not expressions? And why postfix, not prefix?

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019: Without pointer arithmetic, the convenience value of pre- and postfix increment operators drops. By removing them from the expression hierarchy altogether, expression syntax is simplified and the messy issues around order of evaluation of ++ and -- (consider f(i++) and p[i] = q[++i]) are eliminated as well. The simplification is significant. As for postfix vs. prefix, either would work fine but the postfix version is more traditional; insistence on prefix arose with the STL, a library for a language whose name contains, ironically, a postfix increment.

26) How can you format a string without printing?

You should the following command to format a string without printing:

return fmt.Sprintf (“at %v, %s” , e.When , e.What )


27) What is Syntax like in Go programming language?

The GO programming language syntax is specified using Extended Backus-Naur Form (EBNF):

  • Production = production_name “=” [ Expression ]
  • Expression = Alternative { “l” Alternative }
  • Alternative = Term { Term }
  • Term = Production_name l token [ “?”token] l Group l Option l Repetition
  • Group = ” ( “” Expression”)”
  • Option = ” [ ” Expression “” ]”
  • Repetition = ” {” Expression “}”

28) Does Go programming language support type inheritance?

Go programming language doesn’t provide support for type inheritance.


29) Does Go programming language support operator overloading?

Go programming language doesn’t provide support for operator overloading.


30) Does Go support method overloading?

Go programming language doesn’t provide support for method overloading.


31) Does Go support pointer arithmetics?

Go programming language doesn’t provide support for pointer arithmetic.


32) What will be the output of the following code?

  1. package main  
  2. import “fmt”  
  3.  const (   
  4.        i = 7  
  5.        j   
  6.        k   
  7.  )  
  8. func main() {  
  9.  fmt.Println(i, j, k)  
  10. }  

Ans:

777

33) What is Go Interfaces?

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019: In GO, interfaces is a way to identify the behavior of an object. An interface is created by using the “type” word, followed by a name and the keyword interface. An interface is specified as two things.

  • A set of methods.
  • Also it is referred as type.

34) What is Type assertion in Go? What does it do?

A type assertion takes an interface value and retrieves from it a value of the specified explicit type.

Type conversion is used to convert dissimilar types in GO.


35) What are the different methods in Go programming language?

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019: In Go programming language there are several different types of functions called methods. In method declaration syntax, a “receiver” is used to to represent the container of the function. This receiver can be used to call function using “.” operator.


36) What is the default value of a local variable in Go?

The default value of a local variable is as its corresponding 0 value.

Top 35+ Go Language (Golang) Interview Question And Answers PDF Download 2019

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