\u3053\u3093\u306b\u3061\u306f\u3002\u75c5\u307f\uff08\u611f\u67d3\u6027\u80c3\u8178\u708e\uff09\u4e0a\u304c\u308a\u306e\u5bfa\u5ca1\u3067\u3059\u3002<\/p>\n
\u6697\u9ed9\u306e\u578b\u5909\u63db\uff08implicit conversions\uff09\u3068\u3044\u3048\u3070\u3001Scala\u754c\u9688\u3067\u306f\u9ed2\u9b54\u8853\u7684\u5b58\u5728\u3068\u3057\u3066\u6709\u540d\u3067\u3059\u304c\u3001
\n\u5b9f\u306fRuby\u306b\u3082\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n
Scala\u306e\u5834\u5408 \u4efb\u610f\u306e\u578b -> \u4efb\u610f\u306e\u578b \u3078\u306e\u5909\u63db\u304c\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u304c\u3001Ruby\u3067\u306f \u4efb\u610f\u306e\u578b -> \u7279\u5b9a\u306e\u578b \u306e\u307f\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3067\u306f\u5b9f\u969b\u306bRuby\u306e\u6697\u9ed9\u306e\u578b\u5909\u63db\u3092\u5b9a\u7fa9\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\n\u4eca\u56de\u306f\u914d\u5217\u3078\u306e\u6697\u9ed9\u306e\u578b\u5909\u63db\u3092\u5b9a\u7fa9\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
class PseudoArray\r\n def initialize(value)\r\n @value = value\r\n end\r\n\r\n def to_ary\r\n [@value]\r\n end\r\nend<\/pre>\nto_ary\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u914d\u5217\u3092\u8fd4\u3059\u3060\u3051\u3067\u3059\u3002
\n\u7c21\u5358\u3067\u3059\u306d\uff01<\/p>\n\u4f7f\u3063\u3066\u307f\u308b<\/h2>\n
\u3067\u306f\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
> pseudo_array = PseudoArray.new(5)\r\n> p [1,2,3,4] + pseudo_array\r\n[1, 2, 3, 4, 5]\r\n=> nil<\/pre>\n\u898b\u4e8b\u3001+\u6f14\u7b97\u5b50\u306b\u3088\u308a\u914d\u5217\u3068\u306e\u9023\u7d50\u304c\u3067\u304d\u307e\u3057\u305f\u3002
\n\u3067\u306f\u3001+\u6f14\u7b97\u5b50\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u3092\u9006\u306b\u3057\u3066\u307f\u305f\u3089\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n> p pseudo_array + [1,2,3,4]\r\nNoMethodError: undefined method `+' for #<PseudoArray:0x7fbf9da97b08 @value=5><\/pre>\nRuby\u3067\u306f\u6f14\u7b97\u5b50\u3082\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306a\u306e\u3067\u3001PseudoArray\u306b\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044+\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u3060\u305d\u3046\u3068\u3057\u3066\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u81ea\u524d\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f...<\/h2>\n
Ruby\u3067\u306e\u6697\u9ed9\u306e\u578b\u5909\u63db\u306f\u3001\u7279\u5b9a\u306e\u578b\u304c\u671b\u307e\u308c\u3066\u3044\u308b\u5f15\u6570\u306b\u4e0e\u3048\u305f\u5834\u5408\u306b\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002
\n\u305f\u3060\u3057\u3001\u3053\u308c\u306f\u81ea\u52d5\u7684\u306b\u884c\u308f\u308c\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u95a2\u6570\u306e\u5185\u90e8\u3067\u5f15\u6570\u306e\u578b\u691c\u8a3c\u3068\u5909\u63db\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002
\n\u305d\u306e\u305f\u3081\u3001\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\u3084\u3001\u81ea\u5206\u3067\u5b9a\u7fa9\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3067\u6697\u9ed9\u306e\u578b\u5909\u63db\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5909\u63db\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n# \u5f15\u6570\u306b\u914d\u5217\u3092\u5fc5\u8981\u3068\u3059\u308b\u4f55\u304b\r\ndef needs_array(array)\r\n array = case\r\n when array.kind_of?(Array)\r\n array\r\n when array.respond_to?(:to_ary)\r\n array.to_ary\r\n else\r\n raise TypeError, \"can't convert #{array.class} into Array\"\r\n end\r\n # do something...\r\nend<\/pre>\n\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u578b<\/h2>\n
\u4ee5\u4e0b\u306e\u578b\u304c\u6697\u9ed9\u306e\u578b\u5909\u63db\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
| \u578b<\/th>\n | \u5909\u63db\u6642\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9<\/th>\n<\/tr>\n |
|---|---|
| Array<\/td>\n | to_ary<\/td>\n<\/tr>\n |
| Hash<\/td>\n | to_hash<\/td>\n<\/tr>\n |
| Integer<\/td>\n | to_int<\/td>\n<\/tr>\n |
| IO<\/td>\n | to_io<\/td>\n<\/tr>\n |
| Proc<\/td>\n | to_proc<\/td>\n<\/tr>\n |
| Regexp<\/td>\n | to_regexp<\/td>\n<\/tr>\n |
| String<\/td>\n | to_str<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n to_proc\u4ee5\u5916\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u306f\u3001\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u30de\u30cb\u30e5\u30a2\u30eb\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u6761\u4ef6\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u69d8\u306a\u8a18\u8ff0\u304c\u3042\u308a\u307e\u3059\u3002 \u6697\u9ed9\u306e\u578b\u5909\u63db\u306e\u4f7f\u3044\u9053<\/h2>\nRuby\u306e\u6697\u9ed9\u306e\u578b\u5909\u63db\u306f\u3001\u81ea\u4f5c\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306a\u3069\u3067\u306f\u578b\u5909\u63db\u51e6\u7406\u3092\u81ea\u524d\u3067\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u3069\u3046\u3057\u3066\u3082\u5229\u7528\u30b7\u30fc\u30f3\u306f\u9650\u3089\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002 Symbol#to_proc\u3092Ruby\u3067\u5b9a\u7fa9\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u88c5\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n class Symbol\r\n def to_proc\r\n Proc.new{|obj| obj.send(self)}\r\n end\r\nend<\/pre>\n |