10 Effective Go Language Interview Questions

Go Language Interview Questions

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10 Effective Go Language Interview Questions

Looking for Go Language Interview Questions. Here are 10 Effective Go Language Interview Questions.

Go is expressive, concise, clean, and efficient. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while it’s novel type system enables flexible and modular program construction. Go compiles quickly to machine code yet has the convenience of garbage collection and the power of run-time reflection. It’s a fast, statically typed, compiled language that feels like a dynamically typed, interpreted language.

Source: Go Official Website.

Go Language Interview Questions

Q1. What is the Go language and what are its benefit?

Go is considered as a general-purpose language that was designed for servers mainly. It is a strongly statically typed language. Go provides inbuilt support for garbage collection. It also supports concurrent programming as well. Programs are constructed using something called packages mainly.

Its efficient management of dependencies is a great feature. Go uses a traditional compile and link model. This compile and link model is used to generate executable binaries.

Benefits:

  1. It supports something called the environment adopting patterns.
  2. Go as fast as far as its compilation time is concerned.
  3. It has Inbuilt concurrency support and lightweight processes which is via goroutines, channels, and select statements.
  4. Go supports Interfaces and Type embedding

Q2. Explain what do you understand by static type variable declaration in the Go language?

Static type variable declaration provides confidence to the compiler that there is nothing but at least one variable that exists with the given name its declared type. This helps the compiler proceeds for further compilation without requiring a variable’s complete detail. Usually, the meaning of a variable in Go is at the time of compilation. At the time of linking of the program, Go compiler needs a formal variable declaration

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Q3. What are the methods of Go?

Go language supports special types of functions. These are called methods. In method declaration syntax, something called a “receiver” is present which is used to represent the function container. The above-defined receiver can be used to call a function using an operator which is denoted by “.”.

Q4. Explain what is a string literal?

This is the basic Go interview questions asked in an interview. A string literal, obtained when a sequence of characters are concatenated, denotes a string constant. There are two forms of the string literal in Go language: –

  1. Raw string literals type: In this case, the value of such literals is character sequence which are between backquotes ‘‘.  The value of a string literal is the string consisting of the uninterrupted character between quotes.
  2. Interpreted string literals type: It is denoted between double quotes which are the standard syntax. The content between the double quotes that may not contain newline characters usually forms the value of the literal in this case.

Q5. Explain what is a package in the Go program?

All GO programs are made up of nothing but packages. The program that starts running in a package is called the main.

Q6. Define what you understand from a workspace in GO Language?

Typically, a workspace is what keeps all of the Go source code. A workspace is a directory on your system hierarchy that contains three additional directories at the root position.

  1. src – this contains GO source files organized into packages
  2. pkg – this contains package objects and
  3. bin – this contains executable commands

src, pkg and bin are folder structure which organizes the source code.

Read Also: 10 Effective Groovy Interview Questions

Q7. What are the advantages of GO?

  1. GO compiles very fast.
  2. Go has concurrency support.
  3. Functions are Go’s first-class objects.
  4. GO supports garbage collection
  5. Strings and Maps are inbuilt into the language.

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Q8. Explain a routine in GO? What method is used to stop goroutine?

A goroutine is a function that runs with other functions in concurrent mode. To stop goroutine, pass the goroutine as a signal channel, this signal channel can be used to push a new value into the program when you want the goroutine to stop. The goroutine polls that channel regularly promptly as it finds a signal, it exists.

Q9. Explain the Syntax For ‘for’ Loop?

The syntax of for loop in Go language is: –
[wpsm_codebox style=”2″]

for loop [condition |( initial; increment; condition) | Range] {
Define statements;
}

[/wpsm_codebox]Explanation: – The control flow in a for a loop –

  1. If a condition is available, then for loop executes until the condition is true, this step is the same as any other language.
  2. When (initial; increment; conditions ) is available then The unit step above is executed first. This step allows for the declaration and initialization of any loop control variables. No requirement to put a statement here, if a semicolon appears. After this, the condition is evaluated. If a condition is true, the main body of the loop is executed.
    After the main statement of the for loop executes correctly, the program’s flow of control jumps goes back up to the next line which is an increment statement. This statement does nothing, but it updates any loop control variables. This statement can be left blank if needed if a semicolon comes after the condition. The next condition is now checked again and then evaluated. If a condition is true, the loop runs once more, and the process repeats itself i.e. the general approach is to first run the body of a loop, then increment step is done, and then again condition is executed. This continues until the condition becomes false and the loop terminates.
  3. if a range is also given, then for loop runs for each value in the range. This is the frequently asked Go interview questions in an interview.

Q10. By how many ways a parameter can be passed to a defined method in the Go language?

When calling a function in Go, there are two ways to pass an argument to a function such as: –

  1. Call by value: This method works by copying the actual value of an argument into the function’s formal parameter. Thus, changes made to the function’s inside parameter do not affect the argument.
  2. Call by reference: This method works by copying the argument address into the formal parameter. The address is used inside the function for accessing the given argument used in the call. It means that parameter changes are made in this way affect the argument.

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