Go sources for go tour (https://go-tour-jp.appspot.com/welcome/1)

0_Go_Tour_excercises.txt

title

1_slice_ex.go

package main

import (
	"golang.org/x/tour/pic"
	"math"
)

func Pic(dx, dy int) [][]uint8 {
	s := make([][]uint8, dx)
	for i := 0; i < dx; i++ {
		s[i] = make([]uint8, dy)
	}

	for i := 0; i < dx; i++ {
		for j := 0; j < dy; j++ {
			s[i][j] = uint8((i * j) % math.MaxUint8)
		}
	}
	return s
}

func main() {
	pic.Show(Pic)
}

1_slice_ex_ranged.go

  package main

import (
	"golang.org/x/tour/pic"
	"math"
)

func Pic(dx, dy int) [][]uint8 {
	s := make([][]uint8, dx)
	for i := range s {
		s[i] = make([]uint8, dy)
	}

	for i:= range s {
		for j := range s[i]{
			s[i][j] = uint8((i * j) % math.MaxUint8)
		}
	}
	return s
}

func main() {
	pic.Show(Pic)
}

2_map_ex.go

package main

import (
	"golang.org/x/tour/wc"
	"strings"
)

func WordCount(s string) map[string]int {
	words := strings.Fields(s)
	counter := map[string]int{}
	for _, w := range words {
		counter[w]++
	}
	return counter
}

func main() {
	wc.Test(WordCount)
}

3_fibonacchi_ex.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int { //内部の関数のスコープをここで切っている
	n := 0
	a, b, tmp := 0, 1, 0
	return func() int{
		switch(n){
		case 0:
			n++
			return 0
		case 1:
			n++
			return 1
		}
			
		tmp = a+b
		a=b
		b=tmp
		return b
	}
}

func main() {
	f := fibonacci()
	for i := 0; i < 10; i++ {
		fmt.Println(f())
	}
}