[Go] Memorizing the order of a map.

package main

import "fmt"

func main() {
    // Create an anomynous struct.
    data := struct {
        m     map[string]string
        order []string
    }{
        m:     make(map[string]string),
        order: []string{},
    }

    // Insert several key/value pairs.
    data.m["Go"] = "Beego"
    data.order = append(data.order, "Go")

    data.m["Python"] = "Django"
    data.order = append(data.order, "Python")

    data.m["Ruby"] = "Rails"
    data.order = append(data.order, "Ruby")

    data.m["PHP"] = "Laravel"
    data.order = append(data.order, "PHP")

    // Iterate these key/value pairs with order.
    for _, e := range data.order {
        fmt.Println(fmt.Sprintf("%s: %s", e, data.m[e]))
    }
}