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Scalaコレクションメソッド入門
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parallelto
July 06, 2017
Technology
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Scalaコレクションメソッド入門
新宿Geek Lounge #shinjukugl
parallelto
July 06, 2017
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Transcript
4DBMB ίϨΫγϣϯϝιου ೖ ৽॓(FFL-PVOHF
5XJUUFS !QBSBMMFMUP ͖ 4DBMB 5ZQF4DSJQU 4XJGUʢΤϯδϣΠʣ ࣄ ΤϯδχΞ ''ޫͷઓ࢜ʢΨνʣ
࣍ wίϨΫγϣϯϝιου͕ͳ͍ੈք wίϨΫγϣϯϝιου wಛ w࣮ྫ w·ͱΊ
ίϨΫγϣϯϝιου ͕ͳ͍ੈք
͠ ίϨΫγϣϯϝιου ͕ͳ͔ͬͨΒʜ
ᶃ ͷγʔέϯε͔ΒʙΛநग़͢Δ ᶄ Λӳޠʹม͢Δ ᶅ ࠷ॳͷҰͭΊΛऔಘ͢Δ
ᶃ ͷγʔέϯε͔ΒʙΛநग़͢Δ ᶄ Λӳޠʹม͢Δ ᶅ ࠷ॳͷҰͭΊΛऔಘ͢Δ UISFF ᶃ ᶄ ᶅ
ɺɺɺɺɺɺ ɺɺɺɺ UISFFɺUXPɺPOFɺpWF pWF UISFF 4FR 4FR 4FR 0QUJPO
None
ͱ ͯ ڪ Ζ ͠ ͍ ੈ ք Ͱ
͋ Δ
ί υ ͕ ʔ ɺ ͢ ͗ Δ ͧ
Υ Υ
ૣ ͘ ʜ ͠ ͯ ͘ Ε ʜ Զ
ͷ Ϋ ϥ ε ͕ ʜ
͏ ͓ ͔ Γ ͩ Ζ ͏
ͦ ͏ ୭ ί Ϩ Ϋ γ
ϣ ϯ ϝ ι ο υ Λ ͬ ͯ ͍ ͳ ͍ ͷ Ͱ ͋ Δ
͔ ͳ Γ ߴ ڃ ͳ ݴ ޠ Ͱ
͋ Γ ଞ ݴ ޠ Ͱ ߦ ͔ ͔ Δ ί υ ʔ ߦ Ͱ ॻ ͚ Δ ͱ ݴ Θ Ε ͯ ͍ Δ ʜ
ͦ ͏ ͏ ͓ ͔ Γ ͩ Ζ
͏ ɺ
୭ ί Ϩ Ϋ γ ϣ ϯ ϝ
ι ο υ Λ ͬ ͯ ͍ ͳ ͍ ͷ Ͱ ͋ Δ
ίϨΫγϣϯϝιου
ίϨΫγϣϯϝιου JTԿʁ wίϨΫγϣϯ͕ఏڙ͢ΔΤϨΨϯτͰڧྗͳ ϝιου܈ wίϨΫγϣϯΛΈཱͯΔͨΊͷ؍Λཁૉ ͔ΒίϨΫγϣϯʹҾ্͖͛Δ wߴ͍ϨϕϧͰίʔσΟϯάՄೳʹ͢Δ
ಛ w͍͢͞ w؆ܿੑ w҆શੑ wߴ w౷Ұੑ
͍͢͞ ˞DPMMFDU'JSTUΛ͏ͱϝιουͰॻ͚·͢ ʙఔͷޠኮͰճԋࢉ΄ͱΜͲͷίϨΫγϣϯૢ࡞Λղܾ ྫʣ಄ͷա͗Δίʔυʹద༻
DPMMFDU'JSTUΛͬͨྫ
؆ܿੑ ୯ޠͰ࣮ݱ ճɺ·ͨ ෳճͷϧʔϓ
҆શੑ *OU #PPMFBO -JTU<*OU> ؔͷೖग़ྗ੩తܕνΣοΫͷର શ4DBMBϢʔβʹΑͬͯςετࡁΈ
ߴ ιʔτͷछྨ͍Ζ͍Ζ wΫΠοΫιʔτ wϚʔδιʔτͳͲ ߴͳιʔτΞϧΰϦζϜͰ࣮͞Ε͍ͯΔ
΅͘ͷߟ͑ͨ ࠷ڧͷTPSU8JUI ܭࢉྔɿ0 OMPHO ಈ࡞֬ೝࡁΈɹςετͳ͠ɹιʔτΞϧΰϦζϜɿϚʔδιʔτ
౷Ұੑ Ͳͷܕʹରͯ͠ಉ͡ԋࢉΛఏڙͯ͠Δ
ิ ࣗલͷTPSU8JUI ίϨΫγϣϯϝιουͷTPSU8JUI ࣗલൺֱؔͷߏจ͕
ࣗલͷTPSU8JUI @ͷলུه๏Ͱ͖ͳ͍
ղܾࡦ ᶃύϥϝʔλʹܕࢦఆ ᶄϝιουʹܕࢦఆ ᶅΧϦʔԽͰܕਪ ίϨΫγϣϯϝιουʹԕ͘ٴͣ
͜͜·ͰͰ͍͍ͩͨ
Ϧετͷͯ͢ͷૢ࡞ɺ ݸͷίϨΫγϣϯϝιουʹΑͬͯ දݱͰ͖Δ͔ɾ൱͔ʁ ˓PSʷ
͑ɿ˓ w IFBE w UBJM w JT&NQUZ ຊ ʹ
େ ͠ ͨ ౕ ͩ Α ͓ લ ʜ
IFBEɺUBJMɺJT&NQUZΛ ͍͔࣮ͬͯͭ͘ ΄ Μ ͱ ͩ
࣮ྫ wߴͳϝιουʹஔ͖͑Δ w͞ͷൺֱ wఴࣈΞΫηε wίϨΫγϣϯؔͰ͋Δ wٯॱιʔτ wؔͷ߹ wਖ਼֨ɾඇਖ਼֨
ߴͳϝιουʹஔ͖͑Δ ൚༻ͳϝιου ߴͳϝιου
ίϨΫγϣϯϝιουʹ ෭࡞༻͕͋Δ߹ʁ wΓɿ4PNF wඪ४ग़ྗɿ
None
ࠈͷि
w݁Ռɿ4PNF wඪ४ग़ྗɿ w݁Ռɿ4PNF wඪ४ग़ྗɿ ෭࡞༻ಉͰͳ͍
ߴԽͷ͓ଋ wՄೳͰ͋Εɺ෭࡞༻Λආ͚Δ w७ਮͳίʔυ͔Β෭࡞༻Λ͢Δ
७ਮͳίʔυ͔Β ෭࡞༻Λ͢Δ
ߴͳϝιουʹ ஔ͖͑Մೳʹ
͞ͷൺֱ FNQUZ/JMΛฦ͢ MFOHUIͷܭࢉྔ0 O MFOHUI$PNQBSF ͷܭࢉྔ 0 MFOHUINJOO
ఴࣈΞΫηε *OEFY0VU0G#PVOET&YDFQUJPO
ίϨΫγϣϯͷ͞Λௐͯ ҆શʹΞΫηε ఴࣈͷൣғ֎ʹΞΫηεͯ͠/POF͕ฦΔ
ఴࣈΛड͚औΓ0QUJPOΛฦ͢ ಉ͡ ͳ͔ͥΒΕ͍ͯͳ͍MJGU
ؔʹͳΔίϨΫγϣϯ ,FZ 7BMVFͱݟͳͤΔ
.BQ'VODUJPO<, 7>ΛNJYJO͍ͯ͠Δ .BQ1BSUJBM'VODUJPO<, 7>NJYJO͍ͯ͠Δ
಄ͷ͞Βʹ؆ܿʹͰ͖Δ
-(5.
ٯॱͰιʔτ ٯॱιʔτதؒίϨΫγϣϯΛ࡞Β͟ΔΛ͑ͳ͍ʁ
TPSUFEϝιουͷఆٛ ҉ͷύϥϝʔλͰ 0SEFSJOH<#>͕ड͚औΕΔ
ͭͷpMUFS ݅"ͱ#ΛͰͭͳ͙
ͭͷNBQ ؔ"ͱ#ΛBOE5IFOͰͭͳ͙
ίϨΫγϣϯϝιου Λඇਖ਼֨ʹ͢Δ ίϨΫγϣϯϝιου ਖ਼֨ɾඇਖ਼֨
4DBMBͷίϨΫγϣϯϝιουجຊਖ਼֨ ɺɺ ɺɺ ɺɺ ɺɺ ɺɺ TFR NBQ qBU.BQ
pMUFS ˞ྫ֎ɿ4USFBNίϨΫγϣϯͷϝιου ෆཁͳதؒίϨΫγϣϯ͕࡞͞ΕΔ
ղܾࡦ ᶃߴͳϝιουʹஔ͖͑Δ ʢDPMMFDU'JSTUͷΑ͏ͳʣ ᶄWJFXϝιουΛ͏
WJFXϝιουΛ͏ ߴͳϝιουͳ͍ͷͰ WJFXΛ͏ ͔݁͠͠Ռ͕4FR7JFX./' ʜ
4FR7JFXͷਖ਼ମ ɺɺ TFR 4FR7JFX. 4FR7JFX./ 4FR7JFX./' TFRΛ෴͏ϥούʔΫϥε ϝιουʹԠͨ͡ඌจࣈ ͕Ճ͞ΕΔ ݁ՌΛಘΔʹ
ਖ਼֨ʹ͢ϝιουΛ͏
GPSDFΛ͏ தؒίϨΫγϣϯ࡞ΒΕͣ ݁ՌͷΈಘΒΕΔ ˞ҙɿখ͞ͳίϨΫγϣϯͰ ɹඇਖ਼֨ʹ͢Δίετͷํ͕ ɹେ͖͍͜ͱ͋Δ
4FR7JFXͷݶք ίϨΫγϣϯϝιουΛ͏ͨͼʹ ඌจࣈ͕૿͍͑ͯ͘4FR7JFX ͦͷݶքʁ
None
େݪ 4FR7JFX............................. .................................. .................................. .................................. ............................. wճNBQͯ͠ಈ͍ͨ wܕએݴͲ͜ʹ͋Δʁ
wճ্ݶ͋Δʁ
·ͱΊ w ίϨΫγϣϯϝιου͋ͬͯྑ͔ͬͨ w ͞ͷൺֱʹMFOHUIΘͳ͍ w ෆཁͳதؒίϨΫγϣϯʹؾΛ͚ͭΑ͏ w ߴͳϝιουΛ͏ w
ؔ߹͢Δ w WJFXΛ͏ w ίϨΫγϣϯૢ࡞͢Δલʹ4DBMB%PDΛோΊΑ͏
ࢀߟࢿྉ w 4DBMBεέʔϥϒϧϓϩάϥϛϯάୈ൛ w %PDVNFOUBUJPOc5IF4DBMB1SPHSBNNJOH-BOHVBHF IUUQXXXTDBMBMBOHPSHEPDVNFOUBUJPO w 4DBMB$PMMFDUJPOT5JQTBOE5SJDLT IUUQTQBWFMGBUJODPNTDBMBDPMMFDUJPOTUJQTBOE USJDLT