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How to Print a Map in Go

How to Print a Map in Go ?

Answer

To print a map in Go, you can iterate over the map using a for range loop to print each key-value pair.


✐ Examples

1 Printing a Map Using for Range Loop

We can print a map in Go by iterating over the map using a for range loop and printing each key-value pair.

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 use a for range loop to iterate over each key-value pair in the map. The loop variables key and value represent each key and value in the map.
  3. Inside the loop, we print the key and value of each pair using the fmt.Printf function.

Go Program

package main

import "fmt"

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

    // Print the map using a for range loop
    for key, value := range myMap {
        fmt.Printf("%s: %d\n", key, value)
    }
}

Output

one: 1
two: 2
three: 3

2 Printing a Map Using Iteration Over Keys

We can print a map in Go by iterating over the keys of the map and printing each key-value pair.

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 use a for range loop to iterate over the keys of the map. The loop variable key represents each key in the map.
  3. Inside the loop, we use the key to get the corresponding value from the map and print the key-value pair using the fmt.Printf function.

Go Program

package main

import "fmt"

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

    // Print the map by iterating over the keys
    for key := range myMap {
        fmt.Printf("%s: %d\n", key, myMap[key])
    }
}

Output

one: 1
two: 2
three: 3

3 Printing a Map Using Iteration Over Map Entries

We can print a map in Go by iterating over the map entries and printing each key-value pair.

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 use a for range loop to iterate over the map entries. The loop variables key and value represent each key and value in the map.
  3. Inside the loop, we print the key and value of each pair using the fmt.Println function.

Go Program

package main

import "fmt"

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

    // Print the map by iterating over the map entries
    for key, value := range myMap {
        fmt.Println(key, ":", value)
    }
}

Output

one : 1
two : 2
three : 3

Summary

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


More Go Maps Tutorials

  1. How to create an Empty Map in Go ?
  2. How to create a Map with Initial Key-Value Pairs in Go ?
  3. How to Print a Map in Go ?
  4. How to Add a Key-Value Pair to a Map in Go ?
  5. How to Set a Default Value for a Key in a Map in Go ?
  6. How to Update the Value for a Key in a Map in Go ?
  7. How to Check if a Map is Empty in Go ?
  8. How to Check if a Key Exists in a Map in Go ?
  9. How to Check if a Value Exists in a Map in Go ?
  10. How to Get the Value Associated with a Key in a Map in Go ?
  11. How to Remove a Key-Value Pair from a Map in Go ?
  12. How to Remove Key-Value Pairs from a Map Based on Values in Go ?
  13. How to Clear All Key-Value Pairs from a Map in Go ?
  14. How to Iterate Over Keys in a Map in Go ?
  15. How to Iterate Over Values in a Map in Go ?
  16. How to Iterate Over Entries (Key-Value Pairs) in a Map in Go ?
  17. How to Get the Size (Number of Key-Value Pairs) of a Map in Go ?
  18. How to Convert a Map to an Array of Keys in Go ?
  19. How to Convert a Map to an Array of Values in Go ?
  20. How to Convert a Map to an Array of Key-Value Pairs in Go ?
  21. How to Merge Two Maps in Go ?
  22. How to Copy a Map in Go ?
  23. How to Check if Two Maps are Equal in Go ?
  24. How to Sort a Map by Keys in Go ?
  25. How to Sort a Map by Values in Go ?
  26. How to Filter a Map Based on Keys in Go ?
  27. How to Filter a Map Based on Values in Go ?
  28. How to Reduce Values in a Map to a Single Value in Go ?
  29. How to Convert an Array of Key-Value Pairs to a Map in Go ?
  30. How to Convert a Map to a JSON String in Go ?
  31. How to Convert a JSON String to a Map in Go ?
  32. How to Swap Keys and Values in a Map in Go ?
  33. How to Create a Map of Maps in Go ?
  34. How to Iterate Over a Map of Maps in Go ?