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refinementsを使ってみた話
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Takeo Fujita
April 20, 2017
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270
refinementsを使ってみた話
Meguro.rb #2 LT
Takeo Fujita
April 20, 2017
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Transcript
SFpOFNFOUTΛ ͬͯΈͨ !ULFP
ࣗݾհ w !ULFP w HSJNPJSFͱ͍͏ձࣾͰεϚϗͷήʔϜ࡞ͬͯ·͢ w αʔόʔαΠυશ෦୲ʢΠϯϑϥؚΊʣ
ࠓͷ༰ w ήʔϜͷӡ༻Ͱࣦഊͨ͠ͱ w ͦͷରԠͷதͰSFpOFNFOUTΛͬͯΈͨ w SVCZͷόʔδϣϯͰ͢
σʔλߋ৽ϑϩʔ Ҏલ w ϚελʔσʔλΛεςʔδϯάڥͷཧը໘͔Β Πϯϙʔτ ϓϥϯφʔ w ࣮ػ֬ೝ ϓϥϯφʔ
w Τϥʔௐࠪ ΤϯδχΞ w σʔλमਖ਼͠ɺ࠶Πϯϙʔτɺ֬ೝ ϓϥϯφʔ w Կ͔܁Γฦ͢ w ͬͨΒຊ൪
ϑϩʔվળ w ΤϥʔͷݪҼ୯७ͳσʔλೖྗϛεͰ͋Δ͜ͱ͕ ଟ͍ w νΣοΫΛࣗಈԽ w ΤϥʔௐࠪෆཁʹͳΕɺೋਓͰ͍ͬͯͨͷ͕Ұ ਓͰ݁͢ΔΑ͏ʹͳΔ
σʔλߋ৽ϑϩʔ վ w ϚελʔσʔλΛεςʔδϯάڥͷཧը໘͔Β Πϯϙʔτ ϓϥϯφʔ w σʔλΛνΣοΫ͢Δδϣϒ͕ࣗಈͰͬͯɺ͓͔ ͠ͳՕॴ͕͋Ε௨
w σʔλमਖ਼͠ɺ࠶Πϯϙʔτ ϓϥϯφʔ w Կ͔܁Γฦ͢ w ࣮ܰ͘ػͰ֬ೝ w ຊ൪
࠷ॳͷ࣮ ࣦഊ w WBMJEBUJPOΛ͏ w ผNPEVMFʹ͚͓͍ͯͯνΣοΫ͢Δͱ͖ʹ NPEVMFΛJODMVEF͢Δ
ྫ w ࣮ࡍͷίʔυͱҧ͍·͢ DMBTT2VFTU"QQMJDBUJPO3FDPSE IBT@NBOZRVFTU@SFXBSET FOE DMBTT2VFTU3FXBSE"QQMJDBUJPO3FDPSE FOE
NPEVMF2VFTU7BMJEBUPS FYUFOE"DUJWF4VQQPSU$PODFSO JODMVEFEEP WBMJEBUFT@QSFTFODF@PGOBNF WBMJEBUFT@QSFTFODF@PGRVFTU@SFXBSET FOE FOE DMBTT.BTUFS%BUB7BMJEBUJPO+PC JODMVEF4VDLFS1VODI+PC EFGQFSGPSN
2VFTUJODMVEF 2VFTU7BMJEBUPS JOWBMJE@SFDPSET2VFTUTFMFDU JOWBMJE OPUJGZ@UP@TMBDL JOWBMJE@SFDPSET FOE FOE
w ͜ΕͰ෦తͳ͕ΒνΣοΫ͕ࣗಈԽͰ͖ͨʂʂ w ΊͰͨ͠ΊͰͨ͠ w ͷ͕ͣͩͬͨʜ
͋Δͷࣄ݅ w Πϯϙʔτͨͣ͠ͷσʔλ͕ೖ͍ͬͯͳ͍ w Γ͢ͱೖͬͨΓೖΒͳ͔ͬͨΓ
ͳͥʁ w JODMVEF͢ΔͱͦΕҎ߱ͦͷϓϩηεͰͣͬͱ JODMVEF͞Εͨ·· w JODMVEFࡁΈͩͱՃͷWBMJEBUJPO͕ΔͨΊɺσʔ λͷೖॱʹΑͬͯTBWFʹࣦഊ͢Δ w VOJDPSOͷϓϩηε͕ෳಈ͍͍ͯͯɺJODMVEF͞ Εͨͷͱ͞Ε͍ͯͳ͍ͷ͕ࠞࡏ͍ͯͨ͠
w ͜ΜͳͣͰͳ͔ͬͨʜ
SFpOFNFOUTΛ͓͏ w ͬͱຊ w ϞϯΩʔύονΛಛఆͷൣғʹݶఆͰ͖Δ w ࠓճνΣοΫ͢Δδϣϒͷத͚ͩʹݶఆ
NPEVMF.BTUFS%BUB7BMJEBUPS SFpOF"QQMJDBUJPO3FDPSEEP EFGBEE@FSSPS@NFTTBHF NFTTBHF !FSSPS@NFTTBHFTcc<> !FSSPS@NFTTBHFTQVTI NFTTBHF FOE
EFGJOWBMJE@NBTUFS@EBUB !FSSPS@NFTTBHFTQSFTFOU FOE EFGWBMJEBUFT@NBTUFS@EBUB EVNNZ FOE FOE FOE
NPEVMF.BTUFS%BUB7BMJEBUPS SFpOF2VFTUEP EFGWBMJEBUFT@NBTUFS@EBUB WBMJEBUFT@QSFTFODF@PG@OBNF WBMJEBUFT@QSFTFODF@PG@RVFTU@SFXBSET FOE EFGWBMJEBUFT@QSFTFODF@PG@OBNF JGOBNFCMBOL BEE@FSSPS@NFTTBHF
OBNF͕ۭͰ͢ FOE FOE EFGWBMJEBUFT@QSFTFODF@PG@RVFTU@SFXBSET JGRVFTU@SFXBSETCMBOL BEE@FSSPS@NFTTBHF RVFTU@SFXBSET͕ͳ͍Ͱ͢ FOE FOE FOE FOE
VTJOH.BTUFS%BUB7BMJEBUPS DMBTT.BTUFS%BUB7BMJEBUJPO+PC JODMVEF4VDLFS1VODI+PC EFGQFSGPSN JOWBMJE@SFDPSET2VFTUTFMFDUEPcRVFTUc RVFTUWBMJEBUFT@NBTUFS@EBUB RVFTUJOWBMJE@NBTUFS@EBUB FOE OPUJGZ@UP@TMBDL
JOWBMJE@SFDPSET FOE FOE
VTJOH.BTUFS%BUB7BMJEBUPS 34QFDEFTDSJCF2VFTUEP EFTDSJCFWBMJEBUFT@QSFTFODF@PG@OBNFEP TVCKFDU\CVJME RVFTU OBNF ^ CFGPSFEP TVCKFDUWBMJEBUFT@QSFTFODF@PG@OBNF FOE
JUEP FYQFDU TVCKFDUWBMJE@NBTUFS@EBUB UPCF@GBMTFZ FOE ͜ΕͩͱVOEFpOFENFUIPEʹͳΔ JUT WBMJE@NBTUFS@EBUB \TIPVMECF@GBMTFZ^ FOE FOE
·ͱΊ w SFpOFNFOUTΛ͏͜ͱʹΑͬͯɺӨڹൣғΛߜͬ ͯΫϥεఆٛΛมߋ͢Δ͜ͱ͕Ͱ͖ͨ w ϝιου໊ΛݩʹWBMJEBUFT@ Λશ෦ݺͼग़͢Α͏ ͳ࣮ʹ͔͕ͨͬͨ͠ɺ0CKFDUNFUIPETͰऔΕ ͳ͍ w
ϝιου͕औΕͳ͍ͷͰίʔυΛಡ·ͳ͍ͱνΣο Ϋ߲͕Θ͔Βͳ͍