How to Iterate Over Values in a Map in Go - Step by Step Examples

How to Iterate Over Values in a Map in Go ?

Answer

To iterate over values in a map in Go, you can use a range-based for loop. This allows you to access each value in the map.

✐ Examples

1 Iterating Over Values Using Range-Based For Loop

We can iterate over values in a map in Go using a range-based for loop, which provides a convenient syntax for iterating over all values in the map.

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 use a range-based for loop to iterate over the map. The loop extracts the value from each key-value pair in the map.
We print each value to the console using the fmt.Println function to verify that we are iterating over all values.

Go Program

package main

import "fmt"

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

    // Iterate over values using range-based for loop
    for _, value := range myMap {
        fmt.Println(value)
    }
}

Output

1
2
3

2 Iterating Over Keys and Values Using Range-Based For Loop

We can iterate over keys and values in a map in Go using a range-based for loop, which provides a way to access both keys and 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 use a range-based for loop to iterate over the map. The loop extracts both the key and value from each key-value pair in the map.
We print each value along with its corresponding key to the console using the fmt.Println function to verify that we are iterating over all keys and values.

Go Program

package main

import "fmt"

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

    // Iterate over keys and values using range-based for loop
    for key, value := range myMap {
        fmt.Println(key, value)
    }
}

Output

one 1
two 2
three 3

3 Storing and Iterating Over Values Separately

We can store values in a separate slice and then iterate over the slice in Go, which provides a way to work with values independently of their keys.

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 range-based for loop to iterate over the map and append each value to the values slice.
We use another range-based for loop to iterate over the values slice and print each value to the console using the fmt.Println function to verify that we have stored all values separately.

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

    // Store values in the slice
    for _, value := range myMap {
        values = append(values, value)
    }

    // Iterate over the values slice
    for _, value := range values {
        fmt.Println(value)
    }
}

Output

1
2
3

Summary

In this tutorial, we learned How to Iterate Over Values in a Map in Go language with well detailed examples.

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How to Iterate Over Values in a Map in Go - Step by Step Examples