「ズンドコキヨシ」と擬似乱数 ref: http://qiita.com/spiegel-im-spiegel/items/6a5bc07dbfa46a328e26

file1.txt

$ go run zundoko.go
ドコズンドコズンズンドコズンズンドコドコズンドコドコドコズンズンズンズンドコキ・ヨ・シ！

file2.go

// A Source represents a source of uniformly-distributed
// pseudo-random int64 values in the range [0, 1<<63).
type Source interface {
    Int63() int64
    Seed(seed int64)
}

file3.go

import (
    "math/rand"
    "time"

    "github.com/seehuhn/mt19937"
)

func generate() chan string {
    ch := make(chan string)
    go func() {
        var zundoko = [2]string{zun, doko}
        r := rand.New(mt19937.New())
        r.Seed(time.Now().UnixNano())
        for {
            ch <- zundoko[r.Intn(2)]
        }
    }()
    return ch
}

zundoko.go

package main

import (
    "fmt"
    "math/rand"
    "time"
)

const (
    zun     = "ズン"
    doko    = "ドコ"
    kiyoshi = "キ・ヨ・シ！"
)

func generate() chan string {
    ch := make(chan string)
    go func() {
        var zundoko = [2]string{zun, doko}
        rand.Seed(time.Now().UnixNano())
        for {
            ch <- zundoko[rand.Intn(2)]
        }
    }()
    return ch
}

func main() {
    zundoko := generate()
    zcount := 0
    for {
        zd := <-zundoko
        fmt.Print(zd)
        if zd == zun {
            zcount++
        } else if zcount >= 4 {
            break
        } else {
            zcount = 0
        }
    }
    fmt.Print(kiyoshi)
}