ちょっとgolangいじったし寝る #CodePiece

CodePiece.go

package main

import "fmt"

type Person struct {
	*Programmer
	name string
	age  int
}

type Programmer struct {
	language string
}

func newProgrammer(language string) *Programmer {
	return &Programmer{language}
}

func newPerson(name string, age int, language string) *Person {
	return &Person{newProgrammer(language), name, age}
}

func (p Programmer) coding() {
	fmt.Printf("Hi, I'm %s programmer.", p.language)
}

func (p Person) greet() {
	fmt.Printf("Hi, %s\n", p.name)
}

func main() {
	person := newPerson("Motoki", 30, "Swift")
	person.greet()
	person.coding()

	// runeはUnicodeそのものを表す
	r := []rune("日本語")
	fmt.Printf("%#U\n", r[0])

	// 配列
	var array1 [5]int
	fmt.Println(array1)

	array1[2] = 5
	fmt.Println(array1)

	array2 := [3]string{"a", "b", "c"}
	fmt.Println(array2)

	array3 := [...]string{"サイズ", "を", "省略", "できる"}
	fmt.Println(array3)
	fmt.Println(len(array3)) // 配列の長さ

	// map==連想配列
	var map1 map[string]int = map[string]int{}
	map1["one"] = 1
	map1["two"] = 2
	fmt.Println(map1)

	map2 := map[int]bool{1: true, 2: false}
	fmt.Println(map2)
	fmt.Println(map2[2])

	a := [...]int{1, 2, 3, 4}
	fmt.Printf("%#v\n", a)

	// 配列からスライス
	s := a[:]
	fmt.Printf("%#v\n", s)

	// リテラルからスライス
	s2 := []string{"a", "b", "c"}
	fmt.Printf("%#v\n", s2)

	// makeを使ったスライス
	s3 := make([]bool, 2, 5)
	fmt.Printf("%#v\n", s3)
	fmt.Println(len(s3))
	fmt.Println(cap(s3))

	// スライスのコピー
	sl1 := []int{1, 2, 3, 4, 5}
	sl2 := make([]int, 2)
	copy(sl2, sl1[1:3])
	fmt.Printf("%#v\n", sl2)

	sl2[0] = 5
	fmt.Printf("%#v\n", sl2)

	// const
	const (
		One   = 1
		Two   = 2
		Three = 3
	)
	fmt.Println(One)
	fmt.Println(Two)
	fmt.Println(Three)

	if One == 1 {
		fmt.Println("One is 1")
	} else {
		fmt.Println("One is not 1")
	}

	if twice := One * 2; twice == 3 {
		fmt.Println("One * 2 = 3")
	} else if twice == 2 {
		fmt.Println("One * 2 = 2")
	} else {
		fmt.Println("other")
	}

	for_array := [...]int{9999, 14514, 134, 123, 41}
	for i, element := range for_array {
		fmt.Printf("%d: %d\n", i, element)
	}

	japanese := "日本語"
	for i, element := range japanese {
		fmt.Printf("%d: %#U\n", i, element)
	}

}