Top golang interview questions

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Real interview questions from top companies for Golang. Includes theoretical concepts and coding problems.

What is the main difference between Golang and other programming languages?

What are goroutines and how do they differ from threads?

What are channels and how are they used in Golang?

What is the purpose of the select statement in Golang?

What is the difference between a slice and an array in Golang?

What is the purpose of the defer statement in Golang?

What is the difference between the = and := operators in Golang?

What is the purpose of the init function in Golang?

What is the difference between a struct and a class in Golang?

What is the purpose of the interface type in Golang?

What is the difference between the error and panic types in Golang?

What is the purpose of the recover function in Golang?

What is the difference between the sync and mutex packages in Golang?

What is the purpose of the context package in Golang?

Write a Golang program to find the maximum value in a slice of integers.

package main
import "fmt"
func findMax(arr []int) int {
  max := arr[0]
  for _, value := range arr {
    if value > max {
      max = value
    }
  }
  return max
}
func main() {
  arr := []int{1, 2, 3, 4, 5}
  max := findMax(arr)
  fmt.Println(max)
}

Write a Golang program to implement a stack using a slice.

package main
import "fmt"
type Stack []int
func (s *Stack) Push(value int) {
  *s = append(*s, value)
}
func (s *Stack) Pop() int {
  if len(*s) == 0 {
    return 0
  }
  value := (*s)[len(*s)-1]
  *s = (*s)[:len(*s)-1]
  return value
}
func main() {
  stack := &Stack{}
  stack.Push(1)
  stack.Push(2)
  stack.Push(3)
  fmt.Println(stack.Pop())
  fmt.Println(stack.Pop())
  fmt.Println(stack.Pop())
}

Write a Golang program to find the first duplicate in a slice of integers.

package main
import "fmt"
func findFirstDuplicate(arr []int) int {
  seen := make(map[int]bool)
  for _, value := range arr {
    if seen[value] {
      return value
    }
    seen[value] = true
  }
  return 0
}
func main() {
  arr := []int{1, 2, 3, 2, 4}
  duplicate := findFirstDuplicate(arr)
  fmt.Println(duplicate)
}

Write a Golang program to implement a queue using a slice.

package main
import "fmt"
type Queue []int
func (q *Queue) Enqueue(value int) {
  *q = append(*q, value)
}
func (q *Queue) Dequeue() int {
  if len(*q) == 0 {
    return 0
  }
  value := (*q)[0]
  *q = (*q)[1:]
  return value
}
func main() {
  queue := &Queue{}
  queue.Enqueue(1)
  queue.Enqueue(2)
  queue.Enqueue(3)
  fmt.Println(queue.Dequeue())
  fmt.Println(queue.Dequeue())
  fmt.Println(queue.Dequeue())
}

Write a Golang program to find the minimum value in a slice of integers.

package main
import "fmt"
func findMin(arr []int) int {
  min := arr[0]
  for _, value := range arr {
    if value < min {
      min = value
    }
  }
  return min
}
func main() {
  arr := []int{1, 2, 3, 4, 5}
  min := findMin(arr)
  fmt.Println(min)
}