Get ahead in your career with GOlang. Though GOlang remains a comparatively new language, it soon became the choice of development. GOlang offers developers with necessary tools within Go itself, thereby dramatically lowering the time and cost of developing and supporting applications. Programs written in GOlang are generally quicker when compared with other languages. It helps in the development of complex and interesting softwares. GOlang is an open-source programming language. So, its source code is available free of charge. Programs that are written in GOlang usually execute quicker than programs that were written in the other programming languages. GOlang assists in developing complex and interesting software.
In this blog, we are providing you the top 30 GOlang frequently asked questions prepared by the experts in GOlang. We have divided these questions into basic, intermediate, and experienced levels. Learning these questions will help you to clear your interview very easily. So, let's begin.
Ans: GOlang is a free programming language that Google has developed. It is also called GO programming. This language is mainly intended for system programming. GOlang allows us to create simple, efficient, and reliable software with ease. Programs are developed with packages whose properties make it possible to effectively manage dependencies.
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Ans: String constant that resulted from the concatenation of a sequence of characters is represented as a String Literal. It has two forms:
Ans: Within a workspace, a GO code is to be kept. A workspace is a hierarchy of directories that have three directories in root: src, pkg, and bin.
Ans: Data types in GOlang include:
Ans: GOPATH environment variable indicates where the workspace should be. This environment variable must be set during the development of the Go code.
Ans: The packages are directories in the Go workspace, which contains Go source files. Each variable, kind of source file and function are stored in the associated packages. The program begins to function from package main. The program uses packages that have import paths "math/rand" and "fmt".
Ans: A goroutine is a method or function that runs simultaneously along with other goroutines using a special goroutine thread. Goroutine threads are lighter than standard threads. Most of the Golang programs use thousands of goroutines at the same time. For creating a Go routine, we need to add a 'go' keyword before the declaration of the function. By sending a signal channel, we can stop a goroutine. Regularly Goroutine polls that channel; when it detects the signal, it will quit.
Ans: Interfaces are a means of specifying how an object behaves. Using the word "type" followed by the name and keyword interface, an Interface can be created. There are two things that define an interface.
Ans: A rune is a built-in type in Go and is called int32. In Go, the rune is the Unicode CodePoint. Regardless of the number of bytes the codepoint occupies, it may be represented by rune. A string doesn't have to be a rune sequence. We may convert from string to rune, but they are not the same.
Ans: A pointer contains a value's memory address.
& creates a pointer for its operand.
* dereferences a pointer (it will expose the underlying value).
Pointers may be used for:
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Ans: The best way to verify the type of a variable on runtime is using a type switch. It examines variables by type but not by value. Every Switch contains a minimum one 'case' that acts as the conditional Statement, and the 'default' case, it runs if neither case is true. For example, we can create a Type Switch which verifies whether the interface value 'i' includes the type 'string:' or 'int'.
Ans: Dynamic type declaration of a variable expects a compiler for interpreting the variable as per the value that is passed. The compiler does not require a variable to have the static type as an essential requirement.
Ans: Static type declaration of a variable gives the compiler some assurance that there is an existing variable with the type and name provided to allow the compiler to compile further without the need for full details of the variable. The variable declaration is only meaningful at the time of compilation; the compiler requires a real variable declaration during the program linkage.
Ans: In the case of an unbuffered channel, the sender blocks the channel till the data is reached to the receiver from the channel, while the receiver blocks the channel till the data is sent into the channel by the sender.
In comparison with the unbuffered channel, in the buffered channel, the sender will block when no empty slot is available.
Ans: Type conversion is intended to convert different types in GO. A type assertion will take an interface value and fetch a value of the explicitly specified type.
Ans: Go's constants are unique.
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Ans: In GOlang, for writing a multi-line string, we use a raw string literal; here, the string will be delimited by backquotes instead of double-quotes.
Ans: In GO, Array functionality is different than in C.
Ans: In GOlang, there are various functions known as methods. In the syntax of method declaration, for representing the function's container, a 'receiver' is used. We can use this receiver to call the function using the "." operator.
Ans: Modular programming refers to the way of dividing the program into sub-programs like functions or modules in order to reach maximum efficiency.
The definition of more generic functions makes it easy to reuse features, like built-in library functions.
Ans: In Go programming, a pointer will be represented by * followed by the stored value type. A pointer will hold the address of the variable.
Syntax: var a = 2 var s *int s = &a
Here a will be accessed by *s.
Ans: In Golang, the syntax will be defined by the Extended Backus-Naur Form.
Ans: Go has only a single loop construct: 'the for loop'. There are three components in the for loop separated by semicolons: Init statement, condition expression, and query statement.
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Ans: Yes, the Go function may return more than one value, each separated commas within the return statement.
Ans: The simplest way for concatenating a string is using the concatenation operator (+). It enables us to add strings like how we add numeric values.
Ans: Global variables are not recommended as they can be accessed by more than one routine at the same time, and it may lead to unexpected behavior resulting in arbitrary outcomes.
Ans: In Golang, there is no inheritance as it will not support classes. But we can imitate the inheritance by using the composition for using an existing struct object for defining the new object's original behavior. When the new object is created, the features can be expanded beyond the original structure.
All the questions listed above are frequently asked GOlang Interview Questions. They can help you to clear your interview on GOlang. However, if you notice any important question is not covered, you may drop a message to us in the comments. We will get back to you with the answer.
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