Golang Interview Questions

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1. Merge Names

Go Collections Public New

Implement the uniqueNames function. When passed two slices of names, it will return a slice containing the names that appear in either or both slices. The returned slice should have no duplicates.

For example, calling uniqueNames([]string{"Ava", "Emma", "Olivia"}, []string{"Olivia", "Sophia", "Emma"}) should return a slice containing Ava, Emma, Olivia, and Sophia in any order.

Difficulty

Easy

Time

10min

Go 1.13

Show starting code

package main
import "fmt"

func uniqueNames(a, b []string) []string {
    var result []string
    return result
}
    
func main() {
    // should print Ava, Emma, Olivia, Sophia
    fmt.Println(uniqueNames(
        []string{"Ava", "Emma", "Olivia"}, 
        []string{"Olivia", "Sophia", "Emma"}))  
}

Report an issue

Example case: Wrong answer
Each slice has distinct names: Wrong answer
Each slice has duplicate names: Wrong answer
Slices have some names in common: Wrong answer

2. Quadratic Equation

Go Arithmetic Public New

Implement the function findRoots to find the roots of the quadratic equation: ax² + bx + c = 0.

The roots of the quadratic equation can be found with the following formula:

For example, the roots of the equation 2x² + 10x + 8 = 0 are -1 and -4.

Difficulty

Easy

Time

10min

Go 1.13

Show starting code

package main
import "fmt"

func findRoots(a, b, c float64) (float64, float64) {
    return 0, 0
}
    
func main() {
    x1, x2 := findRoots(2, 10, 8)
    fmt.Printf("Roots: %f, %f", x1, x2)
}

Report an issue

Example case: Wrong answer
Equal roots: Wrong answer
Distinct roots: Wrong answer

3. Numeric Input

Go Interfaces Public New

User interface contains NumericInput control, which accepts only digits.

Extend NumericInput structure so that:

It implements UserInput interface.
Add(rune) should add only decimal digits to the input. Other runes should be ignored.
GetValue() should return the current input.

For example, the following code should output "10":

var input UserInput = &NumericInput{}
input.Add('1')
input.Add('a')
input.Add('0')
fmt.Println(input.GetValue())

Difficulty

Easy

Time

15min

Go 1.13

Show starting code

package main
//import "fmt"

type UserInput interface {
   Add(rune)
   GetValue() string
}

type NumericInput struct {
   input string
}
  
func main() {
    //var input UserInput = &NumericInput{}
    //input.Add('1')
    //input.Add('a')
    //input.Add('0')
    //fmt.Println(input.GetValue())
}

Report an issue

Example case: Wrong answer
GetValue() returns input: Wrong answer
Add(rune) adds runes to the input: Wrong answer
Add(rune) adds only decimal digits to the input: Wrong answer

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