questions

Golang questions

• How many bytes of memory does a single precision float32 use?
• Is it possible to change a specific character in a string?
• What is the output of the below code?

var n uint8 = 255
n += 1
fmt.Println(n)

• Explain the code below

str:="dushanbe"
str[0] = 'D' 

• What is the output of the below code?

sum := 0
for {
  sum++ 
}
fmt.Println(sum) 

• What does the built-in len function do when passed a string?

• What is a := "10" - 1 in Go?

• How to effectively concat multiple string?

• What do you understand by byte and rune data types? How are they represented?

• What are the three uses of "..." in Go?

• What's the difference between a type definition and a type alias?

• What does the keyword "make" do?

• What is the output of the below code?

package main  

import "fmt"  

type Aa uint

const (
	x    Aa = 1 << iota 
	y                      
	z                                    
)
func main() {  
 fmt.Println(x, y, z)  
}

• What is slice? Explain array and slice types and the differences between them.
• What is the value of slice1 of the below code?

nums := [6]int{2, 3, 5, 7, 11, 13}
slice1 := nums[1:4]

• What mistakes can be avoided by using the range keyword to iterate over an array?

• How does "append" work?

• What is the output of the below code?

arr1 := [2]int{2,3}
arr2 := [...]int{2,3}
fmt.Println(arr1==arr2)

• Explain the code below

r := [...]int{99: -1}

• What is the output of the below code?

s := []int{5, 6, 7, 8, 9}
s[3] = s[len(s)-1]
s = s[:len(s)-1]
fmt.Println(s)

• What is the output of the below code?

s := []int{1, 2, 3}
func(l []int) {
  l[0] = 42
}(s)
fmt.Println(s[0]) 

• What is CGo in Golang?

• Explain the Golang map type and its advantages.

• What is the zero value for a map type?

• Explain the defer statement in Golang. Give an example of a deferred function’s call.

• In what order are multiple defer statements called?

• Review the code below

func main() {
  count := 5
  if count > 5 {
    message := "Greater than 5"
  } else {
    message := "Not greater than 5"
  }
  fmt.Println(message)
}

• Explain struct in Go (exported, embedding and anonymous fields)

• What does "Arguments are passed by value" mean in functions?
  a) if arguments are pointer, slice, map, function, or channel?
  b) explain about function return

• Explain the code below?

var f func(int) int
f(3)

• What is the Anonymous Functions in Go ?

• What is the output of the below code?

func sum(vals ...int) int {
    total := 0
    for _, val := range vals {
        total += val
    }
    return total
}
func main(){
  fmt.Println(sum())
}

• Explain the Panic and Recover in Go.

• What is the method and method’s receiver in Go?

• What is difference between pointer and value receiver in methods?

• What is an interface?

• What is the empty interface and type Assertion?

• What is the type switch?

• What is the channel?

• What operations are available on the channel type?

• What's the difference between unbuffered and buffered channels?

• What happens if you pass value to a closed channel?

What does the following code print?

c := make(chan int, 1)
for done := false; !done; {
  select {
  default:
    fmt.Print(1)
    done = true
  case <-c:
    fmt.Print(2)
    c = nil
  case c <- 1:
    fmt.Print(3)
  }
}

• What happens if you send or receive on a nil channel?
• What value do you see when you read from a closed channel?
• How do you check whether a channel has been closed?

r := <-c

• What is a goroutine? what is difference between thread?

• What would you use in Go if you wanted to do more than one thing at the same time?

• What keyword is used to start a new independently running task?

• What order do different goroutines run in?

• Deadlocks and race conditions?

• What is the Reflection (reflect) in Go ?

• What is the unsafe package in Go ?

for more

https://github.com/Ebazhanov/linkedin-skill-assessments-quizzes/blob/main/go/go-quiz.md

https://www.knowledgehut.com/interview-questions/golang-interview-questions