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# ホクホクのイモ

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Goで書くとこうなるやつの話。

```package main

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

func main() {
rand.Seed(time.Now().UnixNano())
s := ""
rs := []rune("ホイクモ")
for _, j := range rand.Perm(4)[:2] {
s += string(rs[j])
}
s += s + "の"
for _, j := range rand.Perm(4)[:2] {
s += string(rs[j])
}
fmt.Println(s)
}
```

```ホクホクのクホ
ホイホイのイモ
イモイモのモイ
```

C++ だとこうなる

```#include <algorithm>
#include <iostream>
#include <vector>
#include <locale>
#include <iterator>
#include <random>
#include <codecvt>

std::string
wstring2string(std::wstring& w) {
std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> cv;
return cv.to_bytes(w);
}

int
main() {
std::random_device seed_gen;
std::mt19937 engine(seed_gen());

std::wstring out;

std::wstring hokuimo = L"ホクイモ";
std::shuffle(hokuimo.begin(), hokuimo.end(), engine);
out = hokuimo.substr(0, 2);
std::shuffle(hokuimo.begin(), hokuimo.end(), engine);
out += out + L"の" + hokuimo.substr(0, 2);
std::cout << wstring2string(out) << std::endl;
return 0;
}
```

※ mingw でも実行できる様に wout を使わない様にしています。実行結果は utf-8

Perl だとこう

```use strict;
use warnings;
use utf8;
use List::Util qw/shuffle/;

binmode STDOUT, ':encoding(utf-8)';
my @hokuimo = split('', 'ホクイモ');
my \$hoku = join('', (shuffle(@hokuimo))[0..1]);
my \$imo = join('', (shuffle(@hokuimo))[0..1]);
print "\${hoku}\${hoku}の\${imo}";
```

やはりこういうのを書かせると Ruby の良さは際立つなぁと思いました。

```puts '%1\$s%1\$sの%2\$s'%((%w[ホイクモ]*2).map{|x|x.chars.sample(2).join})
```

(`1\$` は ujihisa さんに教えて貰った)

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