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How to Remove Duplicates in an Array in Go

How to Remove Duplicates in an Array in Go ?

Answer

To remove duplicates from an array in Go, you can use a map or a loop to filter out duplicate elements.


✐ Examples

1 Remove Duplicates using Map

In this example,

  1. We create an array named `numbers` with duplicate integers.
  2. We use a map to store unique elements.
  3. Finally, we convert the map back to an array to get the array without duplicates.

Go Program

package main
import (
    "fmt"
)
func main() {
    numbers := []int{1, 2, 2, 3, 4, 4, 5}
    uniqueNumbers := make(map[int]bool)
    result := []int{}
    for _, num := range numbers {
        if !uniqueNumbers[num] {
            result = append(result, num)
            uniqueNumbers[num] = true
        }
    }
    fmt.Println("Array without duplicates:", result)
}

Output

Array without duplicates: [1 2 3 4 5]

2 Remove Duplicates using Loop

In this example,

  1. We create an array named `colors` with duplicate strings.
  2. We use a loop to check and filter out duplicate elements.
  3. Finally, we get an array without duplicates using the loop method.

Go Program

package main
import (
    "fmt"
)
func main() {
    colors := []string{"red", "green", "blue", "green", "yellow", "blue"}
    uniqueColors := []string{}
    for _, color := range colors {
        found := false
        for _, uc := range uniqueColors {
            if color == uc {
                found = true
                break
            }
        }
        if !found {
            uniqueColors = append(uniqueColors, color)
        }
    }
    fmt.Println("Array without duplicates:", uniqueColors)
}

Output

Array without duplicates: [red green blue yellow]

Summary

In this tutorial, we learned How to Remove Duplicates in an Array in Go language with well detailed examples.


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  28. How to Convert an Array of Strings to an Array of Integers in Go ?
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  30. How to Shuffle an Array in Go ?
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  33. How to Declare an Integer Array in Go ?
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