map-vs-slice-vs-array.go

msa.go

package main

import "log"

const (
	KEY_1 = iota
	KEY_2
	KEY_3
	KEY_4
	KEY_5
)

func main() {
	m := runMap()
	log.Printf("%+v", m)
	s := runSlice()
	log.Printf("%+v", s)
}

func runMap() map[string]string {
	data := map[string]string{
		"key": "val",
	}
	m := make(map[string]string)
	for k, v := range data {
		m[k] = v
	}
	return m
}

func runSlice() []string {
	data := []string{
		KEY_1: "val_1",
		KEY_2: "val_2",
		KEY_3: "val_3",
		KEY_4: "val_4",
		KEY_5: "val_5",
	}

	m := make([]string, len(data))
	for k, v := range data {
		m[k] = v
	}
	return m
}
func runSliceWithAppend() []string {
	data := []string{
		KEY_1: "val_1",
		KEY_2: "val_2",
		KEY_3: "val_3",
	}

	data = append(data, []string{KEY_4: "val_4"}...)
	data = append(data, []string{KEY_5: "val_5"}...)

	m := make([]string, len(data))
	for k, v := range data {
		m[k] = v
	}
	return m
}

func runArray() []string {
	data := [...]string{
		KEY_1: "val_1",
		KEY_2: "val_2",
		KEY_3: "val_3",
		KEY_4: "val_4",
		KEY_5: "val_5",
	}

	m := make([]string, len(data))
	for k, v := range data {
		m[k] = v
	}
	return m
}