Ruby 2.0 (en) - Speaker Deck

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Powered by Rabbit 1.0.4 New features in 2.0 symbol array literals to_h conversion method UTF-8 by default Dtrace / TracePoint 64/143

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Powered by Rabbit 1.0.4 Keyword Arguments in 1.9 def log(msg, opt = {}) level = opt[:level] || "ERROR" time = opt[:time] || Time.now puts "#{ time.ctime } [#{ level }] #{ msg }" end 68/143

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Powered by Rabbit 1.0.4 Keyword Arguments in 1.9 What if you want to combin with arbitrary number of arguments descriptive exceptions pass nil as a valid value 69/143

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Powered by Rabbit 1.0.4 Keyword Arguments in 1.9 def log(*msgs) opt = msgs.last.is_a?(Hash) ? msgs.pop : {} level = opt.key?(:level) ? opt.delete(:level) : "ERROR" time = opt.key?(:time) ? opt.delete(:time) : Time.now raise "unknown keyword: #{ opt.keys.first }" if !opt.empty? msgs.each {|msg| puts "#{ time.ctime } [#{ level }] #{ msg }" } end 70/143

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Powered by Rabbit 1.0.4 Keyword Arguments in 2.0 def log(msg, level: "ERROR", time: Time.now) puts "#{ time.ctime } [#{ level }] #{ msg }" end 71/143

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Powered by Rabbit 1.0.4 Keyword Arguments in 2.0 log("Hello!", **opt) You can pass existing hash as keyword arguments 73/143

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Powered by Rabbit 1.0.4 Keyword Arguments in 2.0 def log(msg, level: "ERROR", time: Time.now, **kw) puts "#{ time.ctime } [#{ level }] #{ msg }" end You can get keyword arguments as a hash Unkown keywords do not raise error 74/143

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Powered by Rabbit 1.0.4 alias method chain class A def foo; puts "foo"; end end class A # reopen def foo_with_bar foo_without_bar puts "bar" end alias_method_chain :foo, :bar end A.new.foo 79/143

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Powered by Rabbit 1.0.4 alias method chain def alias_method_chain(target, feature) alias_method "#{target}_without_#{feature}", target alias_method target, "#{target}_with_#{feature}" end 80/143

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Powered by Rabbit 1.0.4 alias method chain problems many public methods spilled out accidental feature name conflict adding same feature set to classes 81/143

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Powered by Rabbit 1.0.4 Method combination from CLOS(CommonLisp Object System) to extend existing methods confugurable via MOP 82/143

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Powered by Rabbit 1.0.4 Method combination Confugurable via MOP and-combination or-combination whatever-combination 84/143

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Powered by Rabbit 1.0.4 Module#prepend Methods added by #include comes after exisiting methods #prepend put them before to wrap methods 87/143

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Powered by Rabbit 1.0.4 Module#prepend class Foo def foo; p :foo; end end module Prepend def foo p :before super p :after end end class Foo prepend Prepend end Foo.new.foo 88/143

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Powered by Rabbit 1.0.4 Module#prepend Summary Extending exising methods No method name conflict Package features in a module 89/143

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Powered by Rabbit 1.0.4 Refinements module R refine String do def foo ... end end end "".foo # => error! using R "".foo 103/143

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Powered by Rabbit 1.0.4 Other Languages Selector namespace (Smallscript) Classbox (Smalltalk/Java) Extended Method (C#) 104/143

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Powered by Rabbit 1.0.4 Functional programming wannabe Immutable data Pattern matching Lazy evaluation Function composition 112/143

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Powered by Rabbit 1.0.4 Method chains (1..Float::INFINITY).map {|i| i.to_s }.select{|s| /3/ === s }.first(5) This doesn't work 114/143

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Powered by Rabbit 1.0.4 Method chains (1..Float::INFINITY).map_lz {|i| i.to_s }.select_lz{|s| /3/ === s }.first(5) 118/143

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Powered by Rabbit 1.0.4 Enumerable#lazy (1..Float::INFINITY).lazy.map {|i| i.to_s }.select{|s| /3/ === s }.first(5) 121/143