a-tour-of-go-34.go

package main

import "code.google.com/p/go-tour/pic"

func Pic(dx, dy int) [][]uint8 {
	pic := make([][]uint8, dy)
	for y := range pic {
		pic[y] = make([]uint8, dx)
		for x := range pic[y] {
			pic[y][x] = uint8(x ^ y)
		}
	}
	return pic
}

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

a-tour-of-go-40.go

package main

import (
    "strings"
    "code.google.com/p/go-tour/wc"
)

func WordCount(s string) (result map[string]int) {
    result = make(map[string]int)
    for _, c := range strings.Fields(s) {
    	result[c] += 1   
    }
    return
}

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

a-tour-of-go-43.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    x := 0
    y := 1
    return func() (result int) {
    	result = y
        y = x + y
        x = result
        return
    }
}

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

a-tour-of-go-47.go

package main

import "fmt"
import "math/cmplx"

func Cbrt(x complex128) complex128 {
    z := complex128(1.0)
    for i := 0; i<100; i++ {
    	z = z - ((cmplx.Pow(z,3) - x) / (cmplx.Pow(3 * z,2)))
    }
    return z
}

func main() {
    fmt.Println(Cbrt(2))
}