How to Convert a Map to an Array of Values in Go - Step by Step Examples

How to Convert a Map to an Array of Values in Go ?

Answer

To convert a map to an array of values in Go, you can use a for loop to iterate over the map and store the values in a slice. This provides a convenient way to extract all values from the map.

✐ Examples

1 Converting a Map to an Array of Values Using a for Loop

We can convert a map to an array of values in Go using a for loop, which provides a straightforward way to iterate over all key-value pairs and collect the values.

For example,

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.
We declare a slice named values to store the values from the map.
We use a for loop to iterate over the map and append each value to the values slice using the append function.
We print the values to the console using a range-based for loop and the fmt.Println function to verify the conversion.

Go Program

package main

import "fmt"

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

    // Declare a slice to store the values
    var values []int

    // Convert map to an array of values using a for loop
    for _, value := range myMap {
        values = append(values, value)
    }

    // Print the values
    fmt.Println("Values:", values)
}

Output

Values: [1 2 3]

2 Converting an Empty Map to an Array of Values

We can also convert an empty map to an array of values in Go using a for loop, which returns an empty slice when the map is empty.

For example,

We start by declaring an empty map named emptyMap with string keys and integer values.
We declare a slice named values to store the values from the map.
We use a for loop to iterate over the empty map and append each value to the values slice using the append function.
We print the values to the console using a range-based for loop and the fmt.Println function to verify that the slice is empty.

Go Program

package main

import "fmt"

func main() {
    // Declare an empty map
    emptyMap := make(map[string]int)

    // Declare a slice to store the values
    var values []int

    // Convert empty map to an array of values using a for loop
    for _, value := range emptyMap {
        values = append(values, value)
    }

    // Print the values
    fmt.Println("Values:", values)
}

Output

Values: []

3 Converting a Map to an Array of Values After Adding Elements

We can convert a map to an array of values in Go after adding elements using a for loop, which provides an updated slice of all values in the map.

For example,

We start by declaring an empty map named dynamicMap with string keys and integer values.
We add some key-value pairs to the map using the map's index notation.
We declare a slice named values to store the values from the map.
We use a for loop to iterate over the map after adding elements and append each value to the values slice using the append function.
We print the values to the console using a range-based for loop and the fmt.Println function to verify the updated list of values.

Go Program

package main

import "fmt"

func main() {
    // Declare an empty map
    dynamicMap := make(map[string]int)

    // Add elements to the map
    dynamicMap["one"] = 1
    dynamicMap["two"] = 2
    dynamicMap["three"] = 3

    // Declare a slice to store the values
    var values []int

    // Convert map to an array of values using a for loop
    for _, value := range dynamicMap {
        values = append(values, value)
    }

    // Print the values
    fmt.Println("Values:", values)
}

Output

Values: [1 2 3]

Summary

In this tutorial, we learned How to Convert a Map to an Array of Values in Go language with well detailed examples.

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How to Convert a Map to an Array of Values in Go - Step by Step Examples