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Goの値型と参照型

Posted at

Goの値型と参照型。
Array,Structは値型。
Slice,Mapは参照型。

Source

package main

import "fmt"

type Strct struct {
	a, b int
}

func aryFunc(aryVar [3]int) {
	aryVar[0] = 9
}

func sliceFunc(sliceVar []int) {
	sliceVar[0] = 9
}

func mapFunc(mapVar map[string]int) {
	mapVar["a"] = 9
}

func strctFunc(strctVar Strct) {
	strctVar.a = 9
}

func main() {
	fmt.Print("Array:\t値型\t")
	aryVar := [3]int{0, 1, 2}
	aryFunc(aryVar)
	fmt.Println(aryVar) // [0 1 2]

	fmt.Print("Slice:\t参照型\t")
	sliceVar := []int{0, 1, 2}
	sliceFunc(sliceVar)
	fmt.Println(sliceVar) // [9 1 2]

	fmt.Print("Map:\t参照型\t")
	mapVar := map[string]int{"a": 0, "b": 1, "c": 2}
	mapFunc(mapVar)
	fmt.Println(mapVar) // map[a:9 b:1 c:2]

	fmt.Print("Struct:\t値型\t")
	strctVar := Strct{a: 0, b: 1}
	strctFunc(strctVar)
	fmt.Println(strctVar) // {0 1}
}

Output

Array:  値型    [0 1 2]
Slice:  参照型  [9 1 2]
Map:    参照型  map[a:9 b:1 c:2]
Struct: 値型    {0 1}
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