Go Lang Interview Questions For Freshers/Go Lang Interview Questions and Answers for Freshers & Experienced

What is the difference between C arrays and Go slices?

Unlike arrays, slices can be resized using the built-in append function. Further, slices are reference types, meaning that they are cheap to assign and can be passed to other functions without having to create a new copy of its underlying array.

Why is Go often called a “Post-OOP” language?

Go (or “Golang”) is a post-OOP programming language that borrows its structure (packages, types, functions) from the Algol/Pascal/Modula language family. Nevertheless, in Go, object-oriented patterns are still useful for structuring a program in a clear and understandable way.

Name one Go feature that would be helpful for DevOps.

Go's inherent features help enable the best practices for DevOps: immutable packages, testing, build promotion, security, etc. GoCenter is also a great resource for Go developers, providing always-available immutable access to dependencies with important metrics.

What are string literals?

A string literal is a string constant formed by concatenating characters. The two forms of string literal are raw and interpreted string literals.

Raw string literals are written within backticks (foo) and are filled with uninterpreted UTF-8 characters. Interpreted string literals are what we commonly think of as strings, written within double quotes and containing any character except newline and unfinished double-quotes.

Why is type assertion used?

It is used to check values that are held by the interface type variable. It is also used to convert various Go types.

How will you document libraries?

Godoc extracts package documentation from the source code that can be utilized on the command line or the web. An instance is golang.org/pkg/.

Why does my Go process use a lot of virtual memory?

The Go memory allocator preserves a significant portion of virtual memory for allocations, which is local to the specific Go process.

What is shadowing?

In Golang, a shadowed variable is declared in an inner scope with the same name and type as a variable in the outer scope. Here, the outer variable is mentioned after the inner variable is declared.

What is the difference between concurrent and parallel in Golang?

Concurrency potential that two or extra calculations manifest inside the identical time frame, and there is usually some kind of dependency between them.

Parallelism capacity that two or extra calculations show up simultaneously.

What is CGo in Golang?

CGo allows Go packages to invite C code. Given a Go source file that is written with some unique features, CGo yields Go and C files that can be merged into a unique Go package. That is because C means a "pseudo-package", a unique name defined by CGo as a reference to C's namespace.

What is type casting in Go?

Type casting is a way to convert a variable from one data type to another data type. For example, if you want to store a long value into a simple integer then you can type cast long to int. You can convert values from one type to another using the cast operator as following −

type_name(expression)

How to delete an entry from a map in Go?

delete() function is used to delete an entry from the map. It requires map and corresponding key which is to be deleted.

What is the difference between len() and cap() functions of slice in Go?

len() function returns the elements presents in the slice where cap() function returns the capacity of slice as how many elements it can be accomodate.

What is a nil Pointers in Go?

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.

What is the difference between actual and formal parameters?

The parameters sent to the function at calling end are called as actual parameters while at the receiving of the function definition called as formal parameters.

Does Go provide support for OOP via classes?

No, Go isn’t an object-oriented programming language. Interfaces are the way we handle most abstractions in Go, and it requires an entirely different way of thinking.

Are channels and maps safe for concurrent access?

Channels are safe for concurrent access, for this reason they have blocking operations. Maps are unsafe for concurrent access and require a locking mechanism like a mutex to be safely used across goroutines.

What are the different methods in Go programming language?

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.

In GO language how you can check variable type at runtime?

A special type of switch is dedicated in GO to check variable type at runtime, this switch is referred as type switch. Also, you can switch on the type of an interface value with Type Switch.

Explain what Type assertion is used for and how it does it?

Type conversion is used to convert dissimilar types in GO. A type assertion takes an interface value and retrieve from it a value of the specified explicit type.

What is “slice” in Golang?

Slice is a lightweight data structure that is convenient than an array, the slice is a variable-length sequence that stores the homogeneous type of data.

Explain how arrays in GO works differently then C ?

In GO Array works differently than it works in C

* Arrays are values, assigning one array to another copies all the elements
* If you pass an array to a function, it will receive a copy of the array, not a pointer to it
* The size of an array is part of its type. The types [10] int and [20] int are distinct

How a pointer is represented in Go?

In Go, a pointer is represented by using the *(asterisk) character followed by the type of the stored value.

Explain how pointer is represented in GO?

In GO a pointer is represented by using the * (asterisk) character followed by the type of the stored value.

What is the default way of passing parameters to a function?

By default, Go uses call by value to pass arguments. In general, this means that code within a function cannot alter the arguments used to call the function and above mentioned example while calling max() function used the same method.

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.

What is the purpose of continue statement?

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

What is the purpose of break statement?

break terminates the for loop or switch statement and transfers execution to the statement immediately following the for loop or switch.

What is static type declaration of a variable in Go?

Static type variable declaration provides assurance to the compiler that there is one variable existing with the given type and name so that compiler proceed for further compilation without needing complete detail about the variable. 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.

Why does Golang develop?

Golang is developed out of the difficulty in existing environments and languages for system programming.

Go is an effort to have:

* Dynamically typed language and interpreted language
* Compiled language and the safety and efficiency of statistically typed
* To be fast in the compilation
* To support the multi-core computing

Is GoLang fast?

Golang’s concurrency model and small syntax make Golang fast programming language, Golang compilation is very fast, Go hyperlinks all the dependency libraries into a single binary file, as a result, putting off the dependence on servers.

List out the built in support in GO?

The available built-in-support in GO includes

* Container: container/list , container/heap
* Web Server: net/http
* Cryptography: Crypto/md5 , crypto/sha1
* Compression: compress/ gzip
* Database: database/sql

What are the several built-in supports in Go?

A list of built-in supports in Go:

* Container: container/list,container/heap
* Web Server: net/http
* Cryptography: Crypto/md5 ,crypto/sha1
* Compression: compress/ gzip
* Database: database/sql

What are the advantages of GO?

* GO compiles very quickly
* Go supports concurrency at the language level
* Functions are first class objects in GO
* GO has garbage collection
* Strings and Maps are built into the language

Explain what is string types?

A string type represents the set of string values, and string values are sequence of bytes. Strings once created is not possible to change.

What are the advantages/ benefits of Go programming language?

Advantages/ Benefits of Go programming language:

* Go is fast and compiles very quickly.
* It supports concurrency at the language level.
* It has Garbage collection.
* It supports various safety features and CSP-style concurrent programming
features.
* Strings and Maps are built into the language.
* Functions are first class objects in this language.

What is GOPATH environment variable in go programming?

The GOPATH environment variable specifies the location of the workspace. You must have to set this environment variable while developing Go code.

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.

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".

What are string literals?

A string literal is a string constant formed by concatenating characters. The two forms of string literal are raw and interpreted string literals.

Raw string literals are written within backticks (foo) and are filled with uninterpreted UTF-8 characters. Interpreted string literals are what we commonly think of as strings, written within double quotes and containing any character except newline and unfinished double quotes.

What is the scope of a variable?

The scope of a variable means the part of a program where the particular variable can be accessed. In the Go language, every variable is statistically scoped that means the scope of a variable is declared at compile time itself.

Scope of a variable in the Go language is cateGorized into two types:

Local variables these variables are either declared inside a function or a block.

Global variables these variables are declared outside the function or a block.

List data types on Golang?

There are 4 data types in the Go language

1. Basic type numbers, strings, and booleans
2. Aggregate type structures and arrays
3. Reference type slices, pointers, maps, channels, and functions
4. Interface type

List the operators in Golang?

* Arithmetic operators
* Bitwise operators
* Relational operators
* Logical operators
* Assignment operators
* Misc operators

What is a constant variable in Go?

As the name suggests constant means fixed and the meaning doesn’t change in a programming language. Once the value of a constant variable is defined then it should be the same throughout the program, we cannot change the value of a variable in between the program

Explain pointers in Go?

Pointers are variables that hold the address of any variable. Pointers in Golang are likewise called special variables. There are two operators in pointers they are

* operator which is also called a dereferencing operator used to access the value in the address
* & operator which is also called as address operator this is utilized to return the address of the variable

Is Go case sensitive?

True, GoLang is case sensitive which intimates in Go

'ab' and 'AB' are diverse from each other and it doesn't disclose any error if we list these couple of variables in the same code.

Mention the packages in Golang?

As many of the programming languages, the Go programming language also runs on packages, like any other programming Go program also starts for the “main” package, other packages like “fmt”, “math/rand” are imported using the “import” keyword.

What is the dynamic variable declaration in Golang?

A dynamic kind variable declaration needs the compiler to explain the kind of the variable based on the amount transferred to it. The compiler doesn’t need a variable to cateGorise statically as a mandatory condition.

What is the static type declaration of a variable in Golang?

Static type variable declaration gives confirmation to the compiler that there is one variable existing with the given kind and name so the compiler continues for an additional compilation without requiring total insight concerning the variable. A variable declaration holds its importance at the moment of compilation only, the compiler requires actual variable declaration at the moment of connecting to the program.

What is Go?

Go is also known as GoLang, it is a general-purpose programming language designed at Google and developed by Robert Griesemer, ken Thomson and Rob Pike. It is a statistically typed programming language used for building fast and reliable applications.

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