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NDS_36_RubyCurry
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kasacchiful
March 15, 2014
Programming
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1.3k
NDS_36_RubyCurry
NDS#36 の言語セッションでしゃべった内容です。
kasacchiful
March 15, 2014
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Transcript
RubyͷCurryΛ গ͠৯ͯΈͨ ּݪɹʢ@kasacchifulʣ
ࣗݾհ • ּݪɹʢ@kasacchifulʣ • ৽ׁࢢࡏॅ • SIerۈʢΠϯϑϥඋ͕ଟΊʣ • Ruby͕͓ؾʹೖΓ •
VB.NET, Javascript, SQL, PHP, PowerShell
એ
JaSST’14 Niigata • ࣌ɿ20144݄11ʢۚʣ10:00 ʙ 16:50 • ձɿगϝοηɹதձٞࣨ302B • جௐߨԋɿদඌ୩
ప ࢯʮςετͷલʹνʔϜͷݱྗΛσόοά!!ɹɹ ʙݱྗΛܭଌ͠ɼ߹ཧతͳຏ͖ํΛֶͿʙʯ • ϫʔΫγϣοϓɿ૿ా ྱࢠ ࢯʮݱྗͱνʔϜϏϧσΟϯάɹɹɹɹ ʙνʔϜΛ࡞ͬͯɼຏ͍͍ͯͨ͘Ίʹʙʯ • ਃࠐకɿ20144݄4ʢۚʣ • Webɿhttp://jasst.jp/symposium/jasst14niigata.html
Ruby • 19932݄24ੜ·Εɺ1995ެ։ • ΦϒδΣΫτࢦʢ͕ͯ͢ΦϒδΣΫτʣ • ڧ͍ಈతܕ͚ • ެࣜϖʔδɿhttps://www.ruby-lang.org/ja/
Ruby ͷ Curry ͬͯԿʁ
Ruby ͷ Curry hoge = -> (x,y,z) { x +
y * z } ## hoge = lambda {|x,y,z| x + y * z} ͱಉ͡ curry_hoge = hoge.curry ! hoge.call(1,2,3) #=> 7 hoge[2,3,4] #=> 14 ! curry_hoge.call(1).call(2).call(3) #=> 7 curry_hoge[2][3][4] #=> 14
ͦͦ Curry ͬͯԿʁ
Curry ʮΧϦʔԽʯͷ͜ͱ ΧϦʔԽ (currying) ͱɺܭࢉػՊֶͷٕ๏ͷҰͭɻ ෳͷҾΛͱΔؔΛɺҾ͕ʮͱͷؔͷ࠷ॳͷ ҾʯͰΓ͕ʮͱͷؔͷΓͷҾΛऔΓ݁Ռ Λฦؔ͢ʯͰ͋ΔΑ͏ͳؔʹ͢Δ͜ͱɻ ʢग़యɿʮΧϦʔԽ -
Wikipediaʯʣ http://ja.wikipedia.org/wiki/%E3%82%AB%E3%83%AA%E3%83%BC%E5%8C%96
Ruby ͷ Curry hoge = ->(x,y,z) { x + y
* z } curry_hoge = hoge.curry ## curry_hoge = ->(x) { ->(y) { ->(z) { x + y * z }}} ͱಉ͡ ! ɾProc#curry Ruby 1.9 ͔Β͑Δ
Curry ͓͍͍ͬͯ͠ͷʁ
͓͍͍͖ͨͩ͘͠·͠ΐ͏ ΧϦʔԽ͢Δ͜ͱͰɺطଘͷؔʹҾͷΛ෦ద༻͠ ͯɺผͷؔΛ࡞Δ͜ͱ͕ग़དྷ·͢ɻ ! طଘͷؔͷ࠶ར༻ɹɹɹɹɹʮDRYʯɹ ! ͏·͑͘ɺ͓͍͘͠ͳΓ·͢ɻ
Wikipedia ͷྫΛ Ruby Ͱ div = ->(x,y) { x /
y } ## currying cdiv = div.curry #=> ->(x) {->(y) { x/ y }} ## partial application inv = cdiv[1.0] #=> ->(y) { 1.0 / y } inv[3] #=> 0.3333333333333333 inv[10] #=> 0.1
ҙ ʮΧϦʔԽʯͱʮ෦ద༻ʯΛؒҧ͑ͳ͍Α͏ʹ ! ΧϦʔԽɿ->(x,y){x/y} Λ ->(x){->(y){x/y}} ʹม͢Δ͜ͱ ෦ద༻ɿҰ෦ͷҾʹΛద༻ͯ͠ɺผͷؔΛͭ͘Δ ͜ͱ
ଞݴޠͰͷ Curry • ୈҰڃؔΛѻ͑ΔݴޠͰ͋ΕɺΧϦʔԽΛ࣮ࢪ͢Δ ؔΛ࣮Մೳɻ • ྫɿLISP, Scheme, F#, Scala,
Erlang, Eiffel, Perl, Python, Rݴޠ, Sݴޠ, JavaScript • ϥΠϒϥϦͰɺΧϦʔԽؔΛ͑Δݴޠ͋Δ • Groovy ͷ curry ෦ద༻ͳͷͰҙ ग़యɿʮΧϦʔԽ - Wikipediaʯ http://ja.wikipedia.org/wiki/%E3%82%AB%E3%83%AA%E3%83%BC%E5%8C%96
Curry ΛͬͯΈΔ
FizzBuzzͯ͠ΈΔ
·ͱΊ
͓͍͍͠CurryΛ࡞ͬͯ ͓͍͍͖ͨͩ͘͠·͠ΐ͏
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠