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How to Remove Items from Set based on a Condition in Go

How to Remove Items from Set based on a Condition in Go ?

Answer

To remove items from a set (represented as a map) based on a condition in Go, you can iterate over the map and delete items that meet the condition.


✐ Examples

1 Remove Even Numbers from a Set

In this example,

  1. First, we create a map named numberSet to represent the set, with integer keys and boolean values: numberSet := map[int]bool{1: true, 2: true, 3: true, 4: true, 5: true};.
  2. Next, we iterate over the map using a for loop.
  3. Within the loop, we check if the current number (key) is even.
  4. If the number is even, we remove it from the map using the delete function.
  5. We print the updated map to verify that even numbers have been removed.

Go Program

package main
import "fmt"
func main() {
    numberSet := map[int]bool{1: true, 2: true, 3: true, 4: true, 5: true}
    fmt.Println("Original Set:", numberSet)
    for num := range numberSet {
        if num % 2 == 0 {
            delete(numberSet, num)
        }
    }
    fmt.Println("Set after removing even numbers:", numberSet)
}

Output

Original Set: map[1:true 2:true 3:true 4:true 5:true]
Set after removing even numbers: map[1:true 3:true 5:true]

2 Remove Strings Longer Than 4 Characters from a Set

In this example,

  1. First, we create a map named stringSet to represent the set, with string keys and boolean values: stringSet := map[string]bool{"apple": true, "banana": true, "orange": true, "kiwi": true};.
  2. Next, we iterate over the map using a for loop.
  3. Within the loop, we check if the length of the current string (key) is greater than 4.
  4. If the length is greater than 4, we remove the string from the map using the delete function.
  5. We print the updated map to verify that strings longer than 4 characters have been removed.

Go Program

package main
import "fmt"
func main() {
    stringSet := map[string]bool{"apple": true, "banana": true, "orange": true, "kiwi": true}
    fmt.Println("Original Set:", stringSet)
    for str := range stringSet {
        if len(str) > 4 {
            delete(stringSet, str)
        }
    }
    fmt.Println("Set after removing strings longer than 4 characters:", stringSet)
}

Output

Original Set: map[apple:true banana:true orange:true kiwi:true]
Set after removing strings longer than 4 characters: map[kiwi:true]

Summary

In this tutorial, we learned How to Remove Items from Set based on a Condition in Go language with well detailed examples.


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