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How to Remove Key-Value Pairs from a Map Based on Values in Go

How to Remove Key-Value Pairs from a Map Based on Values in Go ?

Answer

To remove key-value pairs from a map in Go based on values, you need to iterate through the map and check each value. If the value matches the specified condition, remove the corresponding key-value pair.


✐ Examples

1 Removing Key-Value Pairs with Specific Value

We can remove key-value pairs from a map in Go by iterating through the map and removing pairs with a specific value.

For example,

  1. We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
  2. We iterate through the map using a range-based for loop. For each key-value pair, we check if the value matches the specified value 2.
  3. If the value matches, we use the delete function to remove the key-value pair from the map.
  4. We print the contents of the map to the console using the fmt.Println function to verify that the key-value pairs have been removed.

Go Program

package main

import "fmt"

func main() {
    // Declare and initialize a map
    myMap := map[string]int{
        "one": 1,
        "two": 2,
        "three": 3,
        "four": 2,
    }

    // Remove key-value pairs with specific value
    for key, value := range myMap {
        if value == 2 {
            delete(myMap, key)
        }
    }

    // Print the contents of the map
    fmt.Println(myMap)
}

Output

map[one:1 three:3]

2 Removing Key-Value Pairs with a Range of Values

We can remove key-value pairs from a map in Go by iterating through the map and removing pairs with values within a specified range.

For example,

  1. We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
  2. We iterate through the map using a range-based for loop. For each key-value pair, we check if the value falls within the specified range (e.g., between 2 and 3 inclusive).
  3. If the value falls within the range, we use the delete function to remove the key-value pair from the map.
  4. We print the contents of the map to the console using the fmt.Println function to verify that the key-value pairs have been removed.

Go Program

package main

import "fmt"

func main() {
    // Declare and initialize a map
    myMap := map[string]int{
        "one": 1,
        "two": 2,
        "three": 3,
        "four": 4,
    }

    // Remove key-value pairs with values in the range [2, 3]
    for key, value := range myMap {
        if value >= 2 && value <= 3 {
            delete(myMap, key)
        }
    }

    // Print the contents of the map
    fmt.Println(myMap)
}

Output

map[one:1 four:4]

3 Removing Key-Value Pairs with Condition-Based Values

We can remove key-value pairs from a map in Go by iterating through the map and removing pairs with values that meet a specified condition.

For example,

  1. We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and string values.
  2. We iterate through the map using a range-based for loop. For each key-value pair, we check if the value meets a specified condition (e.g., if the length of the string is 3).
  3. If the condition is met, we use the delete function to remove the key-value pair from the map.
  4. We print the contents of the map to the console using the fmt.Println function to verify that the key-value pairs have been removed.

Go Program

package main

import "fmt"

func main() {
    // Declare and initialize a map
    myMap := map[string]string{
        "one": "one",
        "two": "two",
        "three": "three",
        "four": "four",
    }

    // Remove key-value pairs where value length is 3
    for key, value := range myMap {
        if len(value) == 3 {
            delete(myMap, key)
        }
    }

    // Print the contents of the map
    fmt.Println(myMap)
}

Output

map[three:three four:four]

Summary

In this tutorial, we learned How to Remove Key-Value Pairs from a Map Based on Values in Go language with well detailed examples.


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