In this post, you will get the most important and top Go Programming Interview Questions and Answers, which will be very helpful and useful to those who are preparing for jobs.
Q1) Why we use go programming language? Which kind of language it is?
We use it for building simple, efficient and reliable software. It is a case sensitive programming language.
Q2) Tell the benefits of go programming language?
- In this language Strings and Maps are built and it is very easy, fast and compiles in a very Quick way.
- It contains numerous safety features with CSP style concurrent programming features.
- It contains garbage collection
- At the language level, it supports concurrency.
- Type embedding and interfaces are supported.
Q3) Why we use a command “return fmt.Sprintf (“at %v, %s” e.When, e.What)
We use this command for formatting a string without printing.
4) Define the interfaces of GO?
Interfaces define the behavior of an object and to create by using the “type” word, which is followed by the keyword and a name. There are two things in Go interfaces. First is “a set of methods”. Second is “referred to as type”
Q5) Who assures the compiler and why?
Static type variable declaration because the compiles can proceed further compilation without complete details of the variables.
Q6) How to create a separate Go tablet for personal use?
Please place the directory with personal library files.
Now import your project/yourlib where Main.go is placed.
Q7) Name the types of channels in Go and uses?
- Buffered Channels are used to perform synchronous communication.
- Unbuffered Channels are used to behave in synchronous communication between goroutines
Q8) Uses of Loop control statements and the infinite loop?
- Loop control statement is to change execution from the normal sequence.
- The infinite loop never turns out to be false and to make an endless loop by the remaining conditional expression empty.
Q9) Why case sensitive languages are used? And for what it is not a success.
To accept commands in the upper case and it cannot reply when the developer enters more than two characters in the lowercase.
Q10) What are operators in Go? Name them.
The operator is a symbol to tell the compiler to perform the logical or mathematical manipulations. Language is rich in built-in operators. They are Relational, Bitwise, logical, Assignment, Miscellaneous and arithmetic operators.
Q11) Where the programs can manipulate? Why it is used?
In a variable, it is one of the storage areas and has a specific type that is used to determine the size and layout of the variables’ memory.
Q12) What are integer Literals?
Integer literals is an octal, hexadecimal constant, decimal. It also has a suffix with the combination of U (unsigned) and L (long) for uppercase and lowercase.
Q13) What are the disadvantages of Go programming language?
- In the conventional sense, Go is not object-oriented.
- It does not support generics.
- The absence of libraries is found that is a UI tool kit.
Q14) What is escape Sequence? and uses
The characters are preceded by a backslash having a special meaning in Go programming. Escape sequence code is used to represent a newline, backspace, and tab.
Q15) Define Rvalue and Lvalue?
- Rvalue indicates a data value that is stored at some address in memory. It appears on the right side of the assignment operator.
- Lvalue is an expression refers to a memory location and
appears on the left side or right side of an assignment. It is designated as a variable.
Q16) What is the workspace in Go and its directories? Define
Go code is workspace and it is a directory with 3 directories at the root.
- “src” contains Go source files is organized into packages.
- “pkg” for package objects
- “bin” for executable commands.
Q17) Define the syntax for the loop?
for[condition | (init; condition;increment ) |Range]
Q18) What the code meant for “var a.b.c = 3.4. “foo” and complete the code?
To print the type of a variable in Go.
“var a.b.c = 3.4. “foo”
Fmt.Printf(“a is of type %Tn”, a)
Q19) What is whitespace in Go?
Whitespace is used to define newline characters, comments, tabs, blanks. It separates one part of a statement from another to enable the compiler for identifying one element in a statement.
Q20) How to set up a local environment for Go programming language? why
To set up a local environment we need two software on the computer.
- A text editor is used to type your programs. The files created with the text editor are called source files.
- Go compiler compiles the source code into the final executable program.
Q21) How to divide the program into subprograms and why?
Modular programming is to divide the programs into modules and function to achieve maximum efficiency. The generic functions are used to re-use functions like the built-in library.
Q22) Name the string literal in Go programming? Define
String literals are a string constant to gain concatenating a sequence of characters. There are two types of literals.
- Raw string literals – Its value is known as string literals and the character sequence is between back Quotes.
- Interpreted string literals – The value is defined as the text is between the double-quotes which do not have newlines.
Q23) What are the different methods in Go?
Several different types of functions are called methods. The declaration syntax “receiver” is used to define the container of the function. And the receiver is used as a function using “.” Operator.
Q24) How to check a variable type at runtime in Go?
A special type of switch is used to check a variable type at runtime in Go. It is known as “type switch”
Q25) Can we use global variables in a program?
No, the Global variable is used by multiple goroutines concurrently and can easily go for an unexpected behavior of arbitrary results.
Q26) Define Type assertion? And its use.
An interface value is taken by type assertion and takes back the value from the specified explicit type. And in Go, it is used for converting dissimilar types.
Q27) What are the packages in Go? Why packages are used.
Packages are a very essential part of GO. The program is made by packages and it starts running in package “main”, Go program is using the packages with import paths “fmt” and “math/rand”. Packages are used for efficient management of dependencies.
Q28) What is the Dynamic type declaration of a variable?
A compiler is needed to interpret the type of the variable on the value to pass. A variable is not needed by the compiler for the type statically which is necessary.
Q29) What is the use of a Break statement?
The loop immediately ends when a break statement goes inside the loop. At the next statement following the loop, the program control resumes. And it is used to end a case in a switch statement.
Q30) What is the purpose of the Goto statement?
In many computer programming languages, we find Goto’s statement. It allows transferring the control of the program for the specified label. A Goto statement gives an unconditional jump to a labeled statement and then it starts executing the code. We can use it anywhere within the function.
Q31) What is the continue statement?
In continuing statement any code skips in between. It forces and controls the next iteration of the loop. The conditional test and increment portions of the loop to execute are caused by the continuing statement.
Q32) What is a Nil pointer in Go?
At the time variable declaration if you do have the exact address then go compiler allows a nil value to a pointer. The nil pointer is a constant and in several standard libraries a value of zero is defined.
Q33) Define structure in Go?
A structure is a user-defined type to allow the group items of different types into a single type. The real-world entity having the set of properties/fields are as a struct. It is a lightweight that supports composition but not inheritance.
Q34) What is a slice in Go?
Slices are indexable having a length. Slice is a segment of an array to give flexibility, power, and convenience compared to the array. The array is used to define the type of variables to hold several same data items.
Q35) Explain type casting in Go?
We can convert a variable from one data type to another data type through typecasting. Cast operator is used to changing the values from one type to another.
For example – Type cast long to int if you want to store a long value into a simple integer.