How to Iterate Through Go Maps in a Specific Order?

Why Maps Print Out of Order

In Go, maps are unordered collections of key-value pairs. This means that the order of elements in a map is not guaranteed. When you iterate over a map, the elements are returned in an arbitrary order, which can be confusing or problematic if you require a specific order.

Getting Maps in Order

To get maps in order, you can use the sort package. Here's an example:

package main

import (
    "fmt"
    "sort"
)

type monthsType struct {
    no   int
    text string
}

var months = map[int]string{
    1:"January", 2:"Fabruary", 3:"March", 4:"April", 5:"May", 6:"June",
    7:"July", 8:"August", 9:"September", 10:"October", 11:"Novenber", 12:"December",
}

func main(){
    // Create a slice of the map keys
    keys := make([]int, len(months))
    i := 0
    for key := range months {
        keys[i] = key
        i++
    }

    // Sort the slice of keys
    sort.Ints(keys)

    // Iterate over the keys and print the corresponding values
    for _, key := range keys {
        fmt.Println(key, "-", months[key])
    }
}

This code will output the map elements in ascending order of the keys:

1 - January
2 - Fabruary
3 - March
4 - April
5 - May
6 - June
7 - July
8 - August
9 - September
10 - October
11 - Novenber
12 - December

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