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はじめてのRuby 第13章 / Ruby Practice 13
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muttan
November 29, 2016
Programming
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はじめてのRuby 第13章 / Ruby Practice 13
muttan
November 29, 2016
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Transcript
ͨͷ͍͠3VCZୈষ
ͨͷ͍͠ ᵋ ?@?P ᵏ
3VCZ
ୈճ
ୈষ"SSBZΫϥε
ྻͷ෮श
w ͋ΔΠϯσοΫεͷཁૉΛऔΓग़͢͜ͱ͕Ͱ͖Δ w ͋ΔΠϯσοΫεͷཁૉʹΛ֨ೲ͢Δ w ΠςϨʔλΛͬͯҰͭͣͭऔΓग़͢ ྻͷ෮श QSJOUBSSBZ<> QSJOUBSSBZ<>lౡాz BSSBZFBDIEPcOBNFc
QVUTOBNF FOE
ྻͷ࡞Γํ
w ྻͷ࡞ΓํʹҎԼͷ༷ͳͷ͕͋Δ "SSBZOFXΛ͏ ҾΛࢦఆ͢Δͱ ͦͷ͚ͩOJM ͰॳظԽͨ͠ྻΛੜ ͭࢦఆ͢Δͱ ࢦఆͨ͠Ͱ ཁૉॳظԽ
w จࣈྻྻΛ͍͍ͨ߹ XΛ͏͜ͱ͕Ͱ͖ ΔʢΧοίͷதʹจࣈྻΛۭന۠ΓͰฒΔʣ w γϯϘϧͷྻΛ࡞Γ͍ͨ߹ JͰ࡞Δ͜ͱ ͕Ͱ͖Δ XJΛ͏
w ྻʹ͍ͨ͠จࣈྻΛғ͏ͨΊͷ۠Γจࣈɺ ʮʢʣʯҎ֎ʹز͔ͭ͑Δͷ͕͋Δ w ʮจࣈྻதʹ۠Γจࣈؚ͕·Ε͍ͯͳ͍ʯ͜ͱ ʹؾΛͬͯɺ্ͷͭͷ͏ͪͲΕ͔Λ͏Α͏ʹ ͢Δ XJΛ͏
w UP@BϝιουΛ͏ͱ ଞͷΦϒδΣΫτΛྻ ΦϒδΣΫτʹม͢Δࣄ͕Ͱ͖Δ UP@BϝιουΛ͏
w จࣈྻΦϒδΣΫτͷTQMJUϝιουΛ͏ͱɺࢦ ఆͨ͠จࣈͰ۠ΒΕͨจࣈྻ͕"SSBZΦϒδΣ Ϋτͱͯ͠ฦ͞ΕΔ w ৄ͘͠ষͰʂ จࣈྻͷTQMJUϝιουΛ͏
ΠϯσοΫεͷ͍ํ
w ྻʹΠϯσοΫεΛࢦఆ BSZ<JOEFY> ͢Δ͜ͱͰ ཁૉΛऔΓग़͢͜ͱ͕Ͱ͖Δ w <>ϝιουͷ͍ํҎԼͷ௨Γ B<JOEFY>
B<ON>PSB<ON> B<O MFO> ཁૉΛऔΓग़͢
w ΠϯσοΫε͕OͷཁૉΛͭऔΓग़͢ํ๏ w ΠϯσοΫεʹෛͷΛࢦఆ͢Δ͜ͱ͕Ͱ͖Δ B<JOEFY>ͷ͍ํ B<> B<> B<> B<> B<>
B<>ͰΞΫηεՄೳ B<>ͰΞΫηεՄೳ
w B<O>͔ΒB<N>·ͰͷཁૉΛฒͨ৽͍͠ྻΛ࡞ͬ ͯฦ͢ w B<>ͱͨ͠߹ɺ<C D E>͕ฦΔ
w NྻαΠζͷ߹ ྻͷҰ൪ޙΖͷཁૉΛ ࢦఆͨ͠߹ͱಉ݁͡ՌʹͳΔ B<ON>ͷ͍ํ lBz lCz lDz lEz lFz ྻB B<>
w B<O>͔ΒB<N>·ͰͷཁૉΛฒͨ৽͍͠ྻΛ࡞ͬ ͯฦ͢ w B<>ͱͨ͠߹ɺ<C D>͕ฦΔ w
NྻαΠζͷ߹ ྻͷҰ൪ޙΖͷཁૉΛ ࢦఆͨ͠߹ͱಉ݁͡ՌʹͳΔ B<OʜN>ͷ͍ํ lBz lCz lDz lEz lFz ྻB B<>
w B<O>͔ΒMFOݸઌ·ͰͷཁૉΛฒͨ৽͍͠ྻΛ ฦ͢ w B< >ͱͨ͠߹ <C D E>͕ฦΔ B<O
MFO>ͷ͍ํ lBz lCz lDz lEz lFz ྻB B< >
w ༻ྫ ཁૉΛऔΓग़͢
w <>ϝιουҎ֎ʹɺಉ͡Α͏ͳಇ͖Λ͢Δϝιο υ͕͍͔ͭ͋͘Δ ཁૉΛऔΓग़͢ ΞΫηεํ๏ ରԠ͢Δૢ࡞ BBU O B<O> BTMJDF
O B<O> BTMJDF ON B<ON> BTMJDF O MFO B<O MFO>
w B<O>JUFNͱ͢Δ͜ͱͰ B<O>ͷཁૉΛJUFNʹม ߋ͢Δ͜ͱ͕Ͱ͖Δ w B<O
MFO>B<ON>ΛͬͨೖՄೳ ཁૉΛஔ͖͑Δ
w ྻBͷ൪ʹཁૉΛૠೖ͢Δ w ʮͱͷྻͷݸͷཁૉΛஔ͖͑Δʯͱߟ͑Δͱ B<O
>X 9:; ͱ͔͚Δ ཁૉΛૠೖ͢Δ lBz lCz lDz lEz lFz ྻB lBz lCz lDz lEz lFz ྻB l9z l:z
w WBMVFT@BUϝιουΛ͏ͱ ඈͼඈͼͷཁૉΛࢀ রͭ͠ͷ৽͍͠ྻΛ࡞Δ͜ͱ͕Ͱ͖Δ w BWBMVFT@BU O O ʜ ͱ͢Δͱ
<B<O> B<O> ʜ >ͱ͍ͬͨྻΛฦ͢ ෳͷΠϯσοΫε͔ΒྻΛ࡞Δ
ू߹ͱͯ͠ͷྻ
w "SSBZΫϥεͷΦϒδΣΫτू߹ͱͯ͠͏͜ͱ Ͱ͖Δ w 3VCZͰ ҎԼͷΑ͏ʹͯ͠ڞ௨ू߹ͱू߹ ू߹ͷࠩΛٻΊΔ͜ͱ͕Ͱ͖Δ ू߹ͷԋࢉ BSZBSZڞ௨ू߹
BSZcBSZू߹ BSZBSZू߹ͷࠩ
w ίʔυྫ ू߹ͷԋࢉ
w ίʔυྫ w ྻΛ݁߹͢Δϝιουʹʮʛʯͷଞʹʮʴʯ ͕͋Δ͕ɺ͕ॏෳͨ͠߹ͷڍಈ͕͜ͱͳΔ ू߹ͷԋࢉ
ʮྻʯͱͯ͠ͷྻ
w ྻ2VFVF4UBDLͱͯ͠͏͜ͱ͕Ͱ͖Δ w ྻͱελοΫؔͳ͍Ζ w "SSBZΫϥεʹ QVTIQPQͱݴͬͨΑ͏ͳϝιο υ͕༻ҙ͞Ε͍ͯΔʢελοΫPSΩϡʔϥΠΫͳ ૢ࡞͕Մೳʣ ʮྻʯͱͯ͠ͷྻ
w ίʔυྫ ʮྻʯͱͯ͠ͷྻ ઌ಄ཁૉʹରͯ͠ ඌཁૉʹରͯ͠ ཁૉՃ VOTIJGU QVTI औΓग़͠ TIJGU
QPQ ࢀর pSTU MBTU
ྻͷओͳϝιου
w ྻʹཁૉΛՃ͑Δํ๏͍͔ͭ͋͘Δ w BVOTIJGU JUFN ྻBͷઌ಄ʹJUFNΛૠೖ͢Δ w BJUFN BQVTI
JUFN ྻBͷඌʹJUFNΛૠೖ͢Δ ྻʹཁૉΛՃ͑Δ
w BDPODBU C B C ྻBʹผͷྻCΛ࿈݁͢ΔDPODBUϝιου ഁյతʢBͷཁૉΛมߋ͢Δʣ͕ ϝιου࿈ ݁ͨ͠৽͍͠ྻΛฦ͢
w B<O>JUFN B<ON>JUFN B<O MFO>JUFN ྻBͷࢦఆͨ͠෦ͷཁૉΛJUFNʹஔ͖͑Δ ྻʹཁૉΛՃ͑Δ
w ίʔυྫ ྻʹཁૉΛՃ͑Δ
w ϨγʔόʹͨΔΦϒδΣΫτͷ෦ঢ়ଶΛมߋ ͯ͠͠·͏ϝιουͷ͜ͱΛʮഁյతϝιουʯ ͱ͍͏ w ҎԼͷΑ͏ͳͷഁյతϝιου ʲίϥϜʳഁյతϝιου
w ҎԼͷΑ͏ͳ߹ʹҙ͕ඞཁͰ͋Δ w BͱCಉ͡ΦϒδΣΫτΛࢦ͍ࣔͯ͠͠ΔͨΊ ഁյతϝιουΛར༻ͯ͠Cͷ༰Λมߋ͢Δͱม Bʹมߋ͕ٴΜͰ͠·͏
ʲίϥϜʳഁյతϝιου
w ഁյతϝιουͷΑ͏ʹ ΦϒδΣΫτͷதΛม ߋͯ͠͠·͏Α͏ͳॲཧΛېࢭ͢Δϝιου͕͋ Δ 0CKFDUGSFF[F w
GSFF[Fͨ͠ͷΛมߋ͠Α͏ͱ͢ΔͱΤϥʔͱͳ Δ 3VOUJNF&SSPS ʲίϥϜʳഁյతϝιου
w 3VCZͷϝιου໊ʹ ʮʂʯ͕͍͍ͯΔ͕ ͋Δ w ഁյతϝιουͱඇഁյతϝιου͕ଘࡏ͢Δ ߹ ഁյతϝιουͷͷʹʮʂʯΛ͚Δͱ͍ ͏ϧʔϧʹͳ͍ͬͯΔ w
ͨͩ͠ ͯ͢ͷഁյతϝιουʹʮʂʯ͕͍ͯ ͍ΔΘ͚Ͱͳ͍ͷͰҙʢEFMFUF@JGͱ͔ʣ ʲίϥϜʳഁյతϝιου
w ͋Δ݅ʹैͬͯྻΛऔΓআ͘ϝιου͕༻ҙ ͞Ε͍ͯΔ w BDPNQBDU BDPNQBDU ྻBͷத͔Βཁૉ͕OJMͰ͋ΔͷΛऔΓআ͘ DPNQBDUϝιουOJMΛऔΓআ͍ͨ৽͍͠ྻ Λฦ͢ͷʹରͯ͠ DPNQBDUϝιουͱͷ
ྻΛஔ͖͑Δʢഁյతϝιουʣ ྻ͔ΒཁૉΛऔΓআ͘
w BEFMFUF Y ྻB͔ΒཁૉYΛऔΓআ͘ϨγʔόࣗΛมߋ ͢Δഁյతϝιου w BEFMFUF@BU O
ྻBͷO൪ͷཁૉʢB<O>ʣΛআ͢Δഁյత ϝιου ྻ͔ΒཁૉΛऔΓআ͘
w DPNQBDU EFMFUF EFMFUF@BUͷྫ ྻ͔ΒཁૉΛऔΓআ͘
w BEFMFUF@JG\cJUFNcʜ^ BSFKFDU\cJUFNcʜ^ BSFKFDU\cJUFNcʜ^ ྻBͷ֤ཁૉʹ͍ͭͯ ϒϩοΫͷ࣮ߦ݁Ռ͕USVF ͩͬͨ߹ʹB͔ΒཁૉΛऔΓআ͘EFMFUF@JGͱ SFKFDUഁյతϝιουͰ͋Δ ྻ͔ΒཁૉΛऔΓআ͘
w BTMJDF O BTMJDF ON BTMJDF O MFO ྻB͔Βࢦఆ͞ΕͨൣғͷཁૉΛऔΓআ͖
औΓ আ͍ͨΛฦͯ͢͢ഁյతϝιου w BVOJR BVOJR ྻBͷॏෳ͢ΔཁૉΛআ͢Δ ྻ͔ΒཁૉΛऔΓআ͘
w EFMFUF@JG SFKFDU TMJDF VOJRͷྫ ྻ͔ΒཁૉΛऔΓআ͘
w BTIJGU Bͷઌ಄ཁૉΛऔΓআ͖ औΓআ͍ͨΛฦ͢ w BQPQ ྻBͷඌཁૉΛऔΓআ͖ औΓআ͍ͨΛฦ͢ ྻ͔ΒཁૉΛऔΓআ͘
w ྻͷதͷཁૉΛผͷཁૉʹஔ͖͑ΔγϦʔζ w ͕͘ͷഁյతϝιουͰ͋Γ ͔ͭͳ͍ ͷ৽͘͠ΦϒδΣΫτΛ࡞ͬͯฦ͢ ྻͷཁૉΛஔ͖͑Δ
w BDPMMFDU\cJUFNcʜ^ BDPMMFDU BNBQ\cJUFNcʜ^ BNBQ ྻBͷ֤ཁૉJUFNʹϒϩοΫΛద༻͠ ͦͷ݁Ռ
ΛूΊͯ৽͍͠ྻΛ࡞Δ w ཁૉͦͷ··͕ͩ ֤ཁૉ͕ϒϩοΫʹΑͬͯ Ճ͞Εͨͷʹͳ͍ͬͯΔ ྻͷཁૉΛஔ͖͑Δ
w BpMM WBMVF BpMM WBMVF CFHJO BpMM WBMVF
CFHJO MFO BpMM WBMVF ON ྻBͷཁૉΛWBMVFʹஔ͖͑Δͭͯ͢ ͷཁૉΛWBMVFʹ ͭCFHJOҎ߱Λ ͭ CFHJO͔ΒMFOݸ ͭONͷൣғΛWBMVFʹஔ ͖͑Δ ྻͷཁૉΛஔ͖͑Δ
w BqBUUFO BqBUUFO ྻBΛฏୱԽ͢ΔฏୱԽͱ ೖΕࢠʹͳͬͨ ྻΛల։ͯͭ͠ͷେ͖ͳྻʹ͢Δ͜ͱ < <
> < < >>>< > ྻͷཁૉΛஔ͖͑Δ
w DPMMFDU NBQ pMMͷྫ ྻͷཁૉΛஔ͖͑Δ
w BSFWFSTF BSFWFSTF ྻBͷཁૉΛٯॱʹฒସ͑Δ w BTPSU BTPSU BTPSU\cJ Kcʜ^
BTPSU\cJ Kcʜ^ ྻBͷཁૉΛιʔτ͢ΔॱংϒϩοΫͰࢦఆ ͢Δ͜ͱ͕Մೳ ྻͷཁૉΛஔ͖͑Δ
w BTPSU@CZ\cJcʜ^ ྻBͷཁૉΛฒସ͑Δฒସ͑ͯ͢ͷཁ ૉʹ͍ͭͯϒϩοΫΛධՁͨ݁͠ՌΛιʔτͨ͠ ॱʹߦΘΕΔ ྻͷཁૉΛஔ͖͑Δ
w SFWFSTF TPSU TPSU@CZͷྫ ྻͷཁૉΛஔ͖͑Δ
ྻͷ֤ཁૉΛॲཧ͢Δ
w ΦʔιυοΫεͳΓ͔ͨ ϧʔϓΛ·Θͯ͠ ΠϯσοΫεΛ͍ͭͣͭΞΫηε͢Δ ܁Γฦ͠ͱΠϯσοΫεΛ͏
w FBDIϝιουΛ͑ൣғΛ໌ࣔతʹॻ͔ͣʹ ͯ͢ͷཁૉʹΞΫηεͰ͖Δ w FBDI@XJUI@JOEFYϝιουΛ͑ ཁૉͱͦͷ ΠϯσοΫεΛ྆ํऔಘͰ͖Δ FBDIϝιουΛར༻͢Δ
w ʮྻͷ֤ཁૉʹର͢Δॲཧ͕ऴΘͬͨ࣌ ͦͷ ྻࠓޙඞཁͳ͍ʯͱ͍ͬͨ߹ʹ QPQϝ ιουΛͬͯॲཧΛ͢Δͱ͍͏ํ๏͋Δ ഁյతͳϝιουͰ܁Γฦ͠Λߦ͏
w ࠓճհͨ͠ϝιουҎ֎ʹ ઌఔհͨ͠ NBQDPMMFDUͷΑ͏ͳΠςϨʔλ͕͋Δ w େମͷॲཧ༻ҙ͞Ε͍ͯΔ͕ ࣗͰ࡞Γ͍ͨ ͱࢥͬͨΒʮ͠ΐ͏͕ͳ͍ͳ͊ʯͱݴ͍ͳ͕Β ࡞Δͷ͍͍ͱࢥ͏ ྻͷ֤ཁૉΛॲཧ͢Δ
ྻͷཁૉ
w ྻͷཁૉ$ͱҧͬͯෳͷΦϒδΣΫτΛ ͭͷྻͰอ࣋͢Δ͜ͱ͕Ͱ͖Δ w ྻͷதʹྻΛೖΕΔʢೖΕࢠʹ͢Δʣࣄ Ͱ͖Δ ྻͷཁૉ
w ߦྻΛʮߦྻͷߦྻʢ࣍ݩྻʣʯΛͬͯද ݱ͍ͨ͠ w ҎԼͷΑ͏ͳྻΛྻΛͬͯ࡞͢Δʹ Ͳ͏ͨ͠Βྑ͍ͩΖ͏͔ʁ ؆୯ͳߦྻΛѻ͏ A = 0
@ 1 2 3 4 5 6 7 8 9 1 A
w ྻͷதʹྻΛೖΕࢠʹͯ͠ੜ͢Ε͍͍ w ߦྻNߦOྻͷཁૉΛऔΓग़͍ͨ͠߹ BSZ<N><O>ͱͯ͠ΞΫηε͢ΕऔΓग़͢͜ ͱ͕Ͱ͖Δ ؆୯ͳߦྻΛѻ͏
w ྻΦϒδΣΫτͷॳظԽʹҰҙ͕ඞཁ Ͱ͋Δ w ҎԼͷΑ͏ͳίʔυΛ࣮ߦͨ࣌͠ ͲͷΑ͏ʹද ࣔ͞ΕΔͩΖ͏͔ʁ ॳظԽʹҙ ཁૉͷྻΛ<
>ͰॳظԽ
w ྻBҎԼͷΑ͏ʹͳ͍ͬͯΔ w ͚͔ͭͩ͠มߋ͍ͯ͠ͳ͍ͷʹԿނ͜͏ͳͬͨ ͷ͔ ॳظԽʹҙ
w "SSBZOFX TJ[F WBM ͱ͍͏ํ๏ ཁૉTJ[F ͷྻΛWBMͰॳظԽͯ͠ฦ͢ͱ͍͏ͷ w ͜ͷࡍWBMෳ͞ΕΔͷͰͳ͘ ྻͷཁૉ
͕ͯͭ͢ͷWBMΛࢀর͢Δͱ͍͏༷ʹͳͬ ͍ͯΔ ॳظԽʹҙ ੜ͞Εͨ ྻ WBM
w ྻͷ֤ཁૉʹผʑͷΦϒδΣΫτΛೖͨ͠ ͍߹ ϒϩοΫΛࢦఆͯ͠ॳظԽ͢Δͱྑ͍ w ϒϩοΫมΛ࡞͢Δͱ ରԠ͢ΔཁૉͷΠϯ σοΫε TJ[FͳΒJEYʹʙ͕ೖΔʣ͕֨ ೲ͞ΕΔ
ॳظԽʹҙ
ෳͷྻʹ ฒߦͯ͠ΞΫηε͢Δ
w ҙͷͷྻ͕͋ͬͯ ͦΕΒͷಉ͡Πϯσο ΫεͷཁૉΛ·ͱΊ͍ͨʢ·ͱΊͯॲཧΛͨ͠ ͍ʣ w ͳʹΛݴ͍ͬͯΔ͔Θ͔Γʹ͍͘ͷͰίʔυΛ ࣔ͢ ෳͷྻʹฒߦͯ͠ΞΫηε
w ͜ͷΑ͏ͳॲཧ[JQϝιουΛ͏ͱ؆ܿʹه ड़͢Δ͜ͱ͕Ͱ͖Δ w [JQϝιου ࣗͱҾʹͨ͠ྻͷ֤ཁ ૉ͔ΒͳΔྻͷྻΛੜͯ͠ฦ͢ ෳͷྻʹฒߦͯ͠ΞΫηε
w [JQϝιουʹϒϩοΫΛ͞ͳ͚Ε࣍ͷΑ͏ ͳڍಈʹͳΔ ෳͷྻʹฒߦͯ͠ΞΫηε ֤ྻͷ൪ͷཁૉ
ࠓճͷ·ͱΊ
·ͱΊ w ྻBSZ<JOEFY>͚ͩͰͳ͘ BSZ<ON>BSZ<Oʜ N> BSZ<O MFO>ͱ͍ͬͨΞΫηεΛ͢Δ͜ͱ͕Ͱ ͖Δ w ൣғΛࢦఆͯ͠Ұׅஔ͖͕͑ՄೳͰ͋Δ
w ΩϡʔελοΫͷΑ͏ʹѻ͏͜ͱ͕Ͱ͖Δ w ͕͍ͨϝιουഁյతͰ͋Δʢͯ͢ͷഁ յతϝιουʹ͕͍͍ͭͯΔΘ͚Ͱͳ͍ʣ