\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n
<\/p>\n
\u5148\u65e5\uff082014\/9\/18\uff09\u306b Ruby 2.2.0 preview1 \u304c\u51fa\u307e\u3057\u305f\u306d\uff01<\/p>\n
\u3044\u304f\u3064\u304b\u65b0\u3057\u3044\u6a5f\u80fd\u3082\u5897\u3048\u3066\u3044\u305f\u306e\u3067\u3001\u6c17\u306b\u306a\u3063\u305f\u3082\u306e\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01\uff08\u8a73\u7d30\u306a\u5909\u66f4\u5185\u5bb9\u306f\u3053\u306e\u30da\u30fc\u30b8<\/a>\u3067\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\uff09<\/p>\n <\/p>\n \u3044\u308f\u3086\u308b\u6052\u7b49\u95a2\u6570\u3068\u547c\u3070\u308c\u308b\u3001\u81ea\u8eab (self) \u3092\u305d\u306e\u307e\u307e\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9 Kernel#itself \u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n \u4ed6\u306e\u8a00\u8a9e\u3067\u3082\u6052\u7b49\u95a2\u6570\u304c\u7d44\u307f\u8fbc\u307f\u3067\u5b58\u5728\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u3001id \u3084 identity \u306a\u3069\u306e\u540d\u524d\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u300c\u540d\u524d\u91cd\u8981\uff01\u300d\u306e Ruby \u3067\u306f\u6052\u7b49\u95a2\u6570\u306e\u5c0e\u5165\u6848\u306f\u4ee5\u524d\u304b\u3089\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u540d\u524d\u304c\u306a\u304b\u306a\u304b\u6c7a\u307e\u3089\u306a\u304b\u3063\u305f\u3068\u3044\u3046\u7d4c\u7def\u304c\u3042\u308a\u307e\u3059\u3002\u4eca\u56de\u306f itself \u3068\u3044\u3046\u540d\u524d\u306b\u843d\u3061\u7740\u3044\u305f\u3088\u3046\u3067\u3001\u3088\u3046\u3084\u304f\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n Kernel#itself \u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u52d5\u304d\u3092\u3057\u307e\u3059\u3002<\/p>\n \u8981\u3059\u308b\u306b self \u3092\u8fd4\u3057\u3066\u304f\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n \u5177\u4f53\u7684\u306a\u5229\u7528\u4f8b\u3067\u3059\u304c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u914d\u5217\u306e\u5024\u81ea\u8eab\u3067 group_by \u3057\u305f\u3044\u5834\u5408\u306b\u7dba\u9e97\u306b\u66f8\u304f\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n \u4ed6\u306b\u3082 send \u3084 sort_by \u306e\u5f15\u6570\u304c\u5b9f\u884c\u6642\u306b\u3057\u304b\u6c7a\u307e\u3089\u306a\u3044\u5834\u5408\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3068\u3057\u3066 itself \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n <\/p>\n \u6570\u5024\u8a08\u7b97\u7cfb\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u304a\u4e16\u8a71\u306b\u306a\u308a\u305d\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n \u6b21\u306e or \u524d\u306e float \u3063\u3066\uff1f\u3068\u601d\u308f\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306b\u306f\u7121\u9650\u306e\u7cbe\u5ea6\u304c\u3042\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u8868\u73fe\u3067\u304d\u308b\u5024\u306f\u98db\u3073\u98db\u3073\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n Float#next_float \u3068 Float#prev_float \u306f\u3001\u8868\u73fe\u53ef\u80fd\u306a\u6b21\u306e or \u524d\u306e\u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n \u3053\u308c\u3092\u5229\u7528\u3059\u308c\u3070\u6a5f\u68b0\u30a4\u30d7\u30b7\u30ed\u30f3\uff081.0 \u3088\u308a\u5927\u304d\u3044\u6700\u5c0f\u306e\u5024\u3068 1.0 \u3068\u306e\u5dee\uff09\u3092\u6c42\u3081\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n <\/p>\n \u30e1\u30bf\u30d7\u30ed\u306e\u5c0f\u9053\u5177\u306b\u306a\u308a\u305d\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n Binding#local_variables \u306f\u305d\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u540d\u524d\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u3001\u547c\u3073\u51fa\u3057\u5143\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n \u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n Binding#receiver \u306f Binding#eval('self') \u3068\u540c\u3058\u7d50\u679c\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\uff08\u826f\u304f\u5229\u7528\u3055\u308c\u308b\u306e\u3067\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\uff09\u3002<\/p>\n \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3057\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3044\u5834\u5408\u306b\u5229\u7528\u3057\u307e\u3059\u3002\u300cRuby: Proc\u306b\u3088\u308b\u5909\u6570\u306e\u96a0\u853d\u3068bindng<\/a>\u300d\u306e\u300cProc#binding\u3068method_missing\u306e\u5408\u308f\u305b\u6280\u300d\u3067\u306f DSL \u3067\u5229\u7528\u3059\u308b\u4f8b\u3092\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305d\u3061\u3089\u3082\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n \u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n <\/p>\n Enumerable#each_slice(n) \u306f n \u500b\u305a\u3064\u306b\u30b9\u30e9\u30a4\u30b9\u3057\u3066\u304f\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u8981\u7d20\u306e\u76f4\u5f8c\u3067\u30b9\u30e9\u30a4\u30b9\u3059\u308b\u30e1\u30bd\u30c3\u30c9 slice_after \u304c\u65b0\u3057\u304f\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3061\u306a\u307f\u306b slice_before \u306f\u524d\u304b\u3089\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n slice_after \u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n \u4ee5\u4e0b\u3001\u5b9f\u884c\u7d50\u679c\u3067\u3059\u3002<\/p>\n Enumerable \u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u306f chunk \u3084 each_cons \u306a\u3069\u89aa\u621a\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u306f\u3058\u3081\u3068\u3057\u3066\u3001\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u6570\u591a\u304f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u3092\u4e00\u8aad\u3057\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002Ruby \u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u30a2\u30c3\u30d7\u3054\u3068\u306b\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308b\u306e\u3067\u3001\u305f\u307e\u306b\u898b\u76f4\u3057\u3066\u307f\u308b\u3068\u300c\u3053\u3093\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u3063\u305f\u306e\u304b\u300d\u3068\u3044\u3046\u3053\u3068\u3082\u591a\u3005\u3042\u308a\u307e\u3059\u3002<\/p>\n <\/p>\n \u30e1\u30bd\u30c3\u30c9\u3092\u30ab\u30ea\u30fc\u5316\u3059\u308b Method#curry \u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n \u4ee5\u4e0b\u306e\u3088\u3046\u306a\u52d5\u4f5c\u3092\u3057\u307e\u3059\u3002<\/p>\n \u30ab\u30ea\u30fc\u5316\u3059\u308b\u3068\u3001\u8907\u6570\u306e\u5f15\u6570\u3092\u53d6\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u3001\u4e00\u3064\u306e\u5f15\u6570\u3092\u53d6\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u9023\u9396\u306b\u5206\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4e8c\u3064\u306e\u5f15\u6570\u3092\u53d6\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u30ab\u30ea\u30fc\u5316\u3059\u308b\u3068\u3001\u5f15\u6570\u304c\u4e00\u3064\u3067\u623b\u308a\u5024\u304c\u300c\u3072\u3068\u3064\u306e\u5f15\u6570\u3092\u53d6\u308b\u30e1\u30bd\u30c3\u30c9\u300d\u3067\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5f15\u6570\u3092\u90e8\u5206\u7684\u306b\u9069\u7528\u3057\u3001\u6b8b\u308a\u306f\u4ed6\u306e\u51e6\u7406\u306b\u4efb\u305b\u308b\u3001\u3068\u3044\u3063\u305f\u3053\u3068\u304c\u7c21\u5358\u306b\u884c\u3048\u307e\u3059\u3002<\/p>\n <\/p>\n Method#super_method \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u308b\u3068\u304d\u306e\u89aa\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n \u30c7\u30d0\u30c3\u30b0\u3067\u5f79\u306b\u7acb\u3064\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n <\/p>\n \u65b0\u6a5f\u80fd\u3092\u3044\u304f\u3064\u304b\u898b\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u4fbf\u5229\u305d\u3046\u306a\u3082\u306e\u304c\u591a\u3044\u3067\u3059\u306d\u3002\u4ed6\u306b\u3082\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30bf\u30eb GC \u3084\u30b7\u30f3\u30dc\u30eb GC \u306a\u3069\u306e\u6027\u80fd\u9762\u306e\u6539\u5584\u306a\u3069\u3082\u884c\u308f\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u6b63\u5f0f\u30ea\u30ea\u30fc\u30b9\u304c\u697d\u3057\u307f\u3067\u3059\u3002<\/p>\n <\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" \u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n <\/p>\n \u5148\u65e5\uff082014\/9\/18\uff09\u306b Ruby 2.2.0 preview1 \u304c\u51fa\u307e\u3057\u305f\u306d\uff01<\/p>\n \tRuby 2.2.0-preview1 \u30ea\u30ea\u30fc\u30b9<\/p>\n \u3044\u304f\u3064\u304b\u65b0\u3057\u3044\u6a5f\u80fd\u3082\u5897\u3048\u3066\u3044\u305f\u306e\u3067\u3001\u6c17\u306b\u306a\u3063\u305f\u3082\u306e\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01\uff08\u8a73\u7d30\u306a\u5909\u66f4\u5185\u5bb9\u306f\u3053\u306e\u30da\u30fc\u30b8\u3067\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u3044\u306b\u6765\u307e\u3057\u305f\uff01\u6052\u7b49\u95a2\u6570: Kernel#itself<\/h2>\n
1.itself # => 1\r\n'Hello'.itself # => 'Hello'\r\n\r\nobject = Object.new\r\nobject.object_id == object.itself.object_id # => true\r\n<\/pre>\n
values = [5, 7, 3, 7, 7, 5, 1, 1, 1, 0]\r\n\r\n# Ruby 2.2.0 \u672a\u6e80\r\nvalues.group_by{|x| x} # => {5=>[5, 5], 7=>[7, 7, 7], 3=>[3], 1=>[1, 1, 1], 0=>[0]}\r\n\r\n# Ruby 2.2.0 \u4ee5\u964d\r\nvalues.group_by(&:itself) # => {5=>[5, 5], 7=>[7, 7, 7], 3=>[3], 1=>[1, 1, 1], 0=>[0]}\r\n<\/pre>\nvalues = %w(apple orange BANANA)\r\n\r\n# \u5b9f\u884c\u6642\u306b\u30bd\u30fc\u30c8\u306e\u6761\u4ef6\u304c\u6c7a\u307e\u308b.\r\nsort_key = :itself\r\nsort_key = :length if sort_by_length?\r\nsort_key = :upcase if sort_by_upcase?\r\n\r\np values.sort_by(&sort_key)\r\n<\/pre>\n
Float#next_float, prev_float<\/h2>\n
123.456.next_float # => 123.45600000000002\r\n123.456.prev_float # => 123.45599999999999\r\n<\/pre>\n
# \u6a5f\u68b0\u30a4\u30d7\u30b7\u30ed\u30f3 (1.0 \u3088\u308a\u5927\u304d\u3044\u6700\u5c0f\u306e\u5024\u3068 1.0 \u3068\u306e\u5dee)\r\nMACHINE_EPSILON = 1.0.next_float - 1.0<\/pre>\n
Binding#local_variables, receiver<\/h2>\n
def call_f\r\n taro = 123\r\n jiro = 456\r\n hanako = 789\r\n f(binding)\r\nend\r\n\r\ndef f(binding)\r\n binding.local_variables.each do |name|\r\n value = binding.local_variable_get(name)\r\n puts \"#{name} = #{value}\"\r\n end\r\nend\r\n\r\ncall_f\r\n<\/pre>\ntaro = 123\r\njiro = 456\r\nhanako = 789<\/pre>\n
class Taro\r\n attr_accessor :name, :age\r\n\r\n def initialize\r\n self.name = 'taro'\r\n self.age = 10\r\n end\r\n\r\n def call_f\r\n f(binding)\r\n end\r\nend\r\n\r\ndef f(binding)\r\n p binding.receiver.name\r\n p binding.receiver.age\r\nend\r\n\r\nTaro.new.call_f\r\n<\/pre>\n
\"taro\"\r\n10<\/pre>\n
Enumerable#slice_after<\/h2>\n
values = %w(\u3057\u308a\u3068\u308a \u30ea\u30d5\u30c6\u30a3\u30f3\u30b0 \u3050\u3093\u307e\u3051\u3093 \u308a\u3093\u3054 \u30b4\u30ea\u30e9 \u30e9\u30c3\u30d1 \u30d1\u30f3 \u3060\u3044\u3053\u3093 \u3066\u3093\u3077\u3089 \u3089\u3063\u304d\u3087\u3046 \u3046\u3069\u3093)\r\n\r\nvalues.slice_after{|string| string =~ \/(\u3093|\u30f3)$\/}.each do |values|\r\n p values\r\nend<\/pre>\n[\"\u3057\u308a\u3068\u308a\", \"\u30ea\u30d5\u30c6\u30a3\u30f3\u30b0\", \"\u3050\u3093\u307e\u3051\u3093\"]\r\n[\"\u308a\u3093\u3054\", \"\u30b4\u30ea\u30e9\", \"\u30e9\u30c3\u30d1\", \"\u30d1\u30f3\"]\r\n[\"\u3060\u3044\u3053\u3093\"]\r\n[\"\u3066\u3093\u3077\u3089\", \"\u3089\u3063\u304d\u3087\u3046\", \"\u3046\u3069\u3093\"]<\/pre>\n
Method#curry<\/h2>\n
def f(a, b, c)\r\n p [a, b, c]\r\nend\r\n\r\n# Method \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3059\u308b.\r\nm = method(:f)\r\n\r\n# \u666e\u901a\u306b\u547c\u3073\u51fa\u3059.\r\nm.call(1, 2, 3)\r\n\r\n# \u30ab\u30ea\u30fc\u5316\u3057\u3066\u304b\u3089\u547c\u3073\u51fa\u3059.\r\nm.curry.call(1).call(2).call(3)\r\n<\/pre>\n
def add(value, adder)\r\n adder.call(value)\r\nend\r\n\r\nadder = lambda{|a, b| a + b}.curry.call(10)\r\n(1..10).each do |x|\r\n puts add(x, adder)\r\nend\r\n<\/pre>\nMethod#super_method<\/h2>\n
class A\r\n def f\r\n end\r\nend\r\n\r\nclass B < A\r\n def f\r\n end\r\nend\r\n\r\nclass C < B\r\n def f\r\n end\r\nend\r\n\r\np C.new.method(:f).source_location\r\np C.new.method(:f).super_method.source_location\r\np C.new.method(:f).super_method.super_method.source_location<\/pre>\n
\u307e\u3068\u3081<\/h2>\n
\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[24],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/4415"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=4415"}],"version-history":[{"count":12,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/4415\/revisions"}],"predecessor-version":[{"id":4430,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/4415\/revisions\/4430"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=4415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=4415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=4415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}