Option Type - Speaker Deck

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0QUJPO5ZQF !XBHZV

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ࠓ೔ͷϙΠϯτ w ओʹ4XJGUͷ࿩͠·͢ w ࠷ۙͷ/VMM͕୅ೖͰ͖ͳ͍ϓϩάϥϛϯάݴޠ͕૿͑ͯΔ w )BTLFMM 4DBMB ' 3VTU 4XJGU ,PUMJO FUD w ࣮ݱ͢Δ࢓૊ΈͷҰ͕ͭ0QUJPO5ZQF w ʢ4XJGUͰ͸0QUJPOBMɺ,PUMJOͰ͸/VMMBCMFͱݴ͍·͢ʣ w ࠷ۙͷྲྀߦΓͳͷͰ+BWB4DSJQUͱ͔ʹ΋͖͡ʹೖΔ͔΋ w ϥΠϒϥϦϕʔεͩͱOPEFPQUJPOTͱ͔͋ΔΜ͚ͩͲݴޠαϙʔτ͕ͳ͍ ͱ͠ΜͲ͍ w ࢖ͬͯΈΔͱͪΐ͍ͪΐ͍τϥοϓ͕͋ΔͷͰͦͷลΛڞ༗

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CJMMJPOEPMMBSNJTUBLF w *DBMMJUNZCJMMJPOEPMMBSNJTUBLF*UXBTUIFJOWFOUJPOPGUIFOVMMSFGFSFODFJO"U UIBUUJNF *XBTEFTJHOJOHUIFpSTUDPNQSFIFOTJWFUZQFTZTUFNGPSSFGFSFODFTJOBO PCKFDUPSJFOUFEMBOHVBHF "-(0-8 .ZHPBMXBTUPFOTVSFUIBUBMMVTFPGSFGFSFODFT TIPVMECFBCTPMVUFMZTBGF XJUIDIFDLJOHQFSGPSNFEBVUPNBUJDBMMZCZUIFDPNQJMFS#VU* DPVMEOUSFTJTUUIFUFNQUBUJPOUPQVUJOBOVMMSFGFSFODF TJNQMZCFDBVTFJUXBTTPFBTZ UPJNQMFNFOU5IJTIBTMFEUPJOOVNFSBCMFFSSPST WVMOFSBCJMJUJFT BOETZTUFNDSBTIFT XIJDIIBWFQSPCBCMZDBVTFEBCJMMJPOEPMMBSTPGQBJOBOEEBNBHFJOUIFMBTUGPSUZZFBST w ͦΕ͸ԯυϧʹ΋૬౰͢ΔࢲͷޡΓͩɻOVMMࢀরΛൃ໌ͨ͠ͷ͸೥ͷ͜ͱͩͬͨɻ౰࣌ɺ ࢲ͸ΦϒδΣΫτࢦ޲ݴޠ "-(0-8 ʹ͓͚ΔࢀরͷͨΊͷแׅతܕγεςϜΛઃܭ͍ͯͨ͠ɻ ໨ඪ͸ɺίϯύΠϥͰͷࣗಈνΣοΫͰશͯͷࢀর͕׬શʹ҆શͰ͋Δ͜ͱΛอূ͢Δ͜ͱͩͬ ͨɻ͔͠͠ɺࢲ͸୯ʹͦΕ͕༰қͩͱ͍͏͚ͩͰɺແޮͳࢀরΛؚΊΔ༠࿭ʹ఍߅Ͱ͖ͳ͔ͬͨɻ ͜Ε͸ɺޙʹ਺͑੾Εͳ͍աͪɺ੬ऑੑɺγεςϜΫϥογϡΛҾ͖ى͜͠ɺաڈ೥ؒͰ ԯυϧ૬౰ͷۤ௧ͱଛ֐ΛҾ͖ىͨ͜͠ͱΈΒΕΔɻ w IUUQXXXJOGPRDPNQSFTFOUBUJPOT/VMM3FGFSFODFT5IF#JMMJPO%PMMBS.JTUBLF5POZ )PBSF

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4XJGU w 4XJGUJTBHFOFSBMQVSQPTFQSPHSBNNJOH MBOHVBHFCVJMUVTJOHBNPEFSOBQQSPBDIUP TBGFUZ QFSGPSNBODF BOETPGUXBSFEFTJHO QBUUFSOT w IUUQTTXJGUPSHBCPVU

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ҎԼɺ4XJGUͷσϞΛ ަ͑ͳ͕Βߦ͖·͢

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/VMMFSSPS w 4XJGUͷී௨ OPOPQUJPOBM ͷม਺͸/VMMඇڐ༰Ͱ͢ w 4XJGUͰ͸OJM͕/VMMͰ͢ w OJMΛม਺ʹ୅ೖ͢ΔͱΤϥʔʹͳΓ·͢ w ద౰ʹ4XJGU৮Δͱଟ෼࠷ॳʹૺ۰͢ΔίϯύΠϥΤϥʔ w Α͘෼͔ͬͯͳ͍ͱ௒ΠϥΠϥ͢Δ w 4XJGUݴޠʹ૊Έࠐ·Ε͍ͯΔػೳͰ͢

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/VMMFSSPS WBSTUS4USJOHOJM

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ॳظԽ w ม਺͸ඇOJM஋ͰॳظԽ͠·͢ w ʢͪͳΈʹ4XJGUͰ͸WBS͕WBSJBCMFɺMFU͕ DPOTUBOUͳͷͰ͕͢ɺҰൠతͳม਺ʗఆ਺ͱ؆୯ ʹଊ͑Δͱ৭ʑ΍΍͍͜͠࿩͕͋Γ·͢ͷͰɺWBS MFUΛ۠ผͤͣม਺ͱදه͍ͯ͠·͢ʣ

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ॳظԽ WBSTUS4USJOHl999z

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0QUJPOBM w OJMͰॳظԽ͍ͨ͠৔߹͸0QUJPOBMܕม਺Λ࢖༻ ͠·͢ w ܕͷޙΖʹ Λ෇͚Δͱ0QUJPOBMܕม਺ʹͳΓ· ͢

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0QUJPOBM WBSTUS4USJOH OJM QSJOU TUS

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0QUJPOBM w ඇ0QUJPOBMܕม਺ʹ0QUJPOBMܕม਺Λ୅ೖ͢Δ ͜ͱ͸Ͱ͖·ͤΜ w 4XJGUΛ࢖ͬͯద౰ʹίʔσΟϯά͢Δͱଟ෼࠷ॳ ʹૺ۰͢Δҙຯෆ໌ͳίϯύΠϥΤϥʔ

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0QUJPOBM GVODG TUS4USJOH \ QSJOU TUS ^ WBSTUS4USJOH OJM G TUS

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6OXSBQ w 0QUJPOBMܕม਺͔Βඇ0QUJPOBMܕͷ஋ΛऔΓग़ ͢͜ͱΛ4XJGUͰ͸6OXSBQͱݺͼ·͢ɻ w 6OXSBQ͢Δʹ͸0QUJPOBMܕม਺ͷޙΖʹΛ෇ ͚·͢ɻ

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6OXSBQ GVODG TUS4USJOH \ QSJOU TUS ^ WBSTUS4USJOH """ G TUS

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0QUJPOBM$IBJOJOH w 0QUJPOBMܕม਺ͷϝϯό 1SPQFSUZNFUIPE ʹ ҆શʹΞΫηε͢Δํ๏Ͱ͢ɻ w 0QUJPOBMม਺ͷޙΖʹ Λ෇͚ͯϝϯόʹΞΫη ε͢ΔͱɺOJMඇOJM໰ΘͣϝϯόʹΞΫηεͰ͖ ·͢ɻ

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0QUJPOBM$IBJOJOH DMBTT5\ WBSTUS4USJOH999 ^ WBSU5 5 WBSTUSU TUS QSJOU TUS UOJM TUSU TUS QSJOU TUS

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0QUJPOBM$IBJOJOH w 0QUJPOBM$IBJOJOH͕ฦ͢஋͸0QUJPOBMܕʹͳΓ ·͢ w 0QUJPOBM$IBJOJOHͰऔಘͨ͠஋Λඇ0QUJPOBMܕ ม਺΍ඇ0QUJPOBMܕҾ਺Λड͚औΔؔ਺ʹ౉ͦ͏ ͱ͢ΔͱίϯύΠϧΤϥʔ͕ൃੜ͠·͢ w 4XJGU͕෼͔͖ͬͯͨͱࢥ͏͜Ζʹૺ۰͢Δͱࢥ ͍·͢

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0QUJPOBM$IBJOJOH DMBTT5\ WBSTUS4USJOH999 ^ GVODG T4USJOH \ QSJOU T ^ WBSU5 5 G U TUS

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0QUJPOBM$IBJOJOH w ༨ஊͰ͕͢ w ͸͋͘·Ͱ΋0QUJPOBM$IBJOJOHͳͷͰ຤ඌ ʹ෇͚Ε·ͤΜ w $P⒎FF4DSJQUॻ͍ͯΔͱΑ͘෼͔Βͳ͘ͳΔ w ͸6OXSBQͳͷ෇͚Ε·͢

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0QUJPOBM$IBJOJOH DMBTT5\ WBST4USJOH 99 ^ WBSD5 WBSTDT WBSUDT

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JGMFUHVBSEFMTF w 0QUJPOBMܕͷม਺΍0QUJPOBM$IBJOJOHͨ͠஋ʹ ҆શʹΞΫηε͍ͨ͠৔߹͸JGMFU͔HVBSEFMTF ߏจ͕ศརͰ͢

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JGMFU DMBTT5\ WBSTUS4USJOH999 ^ GVODG T4USJOH \ QSJOU T ^ WBSU5 5 JGMFUTU TUS\ G T ^

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HVBSEFMTF GVODG T4USJOH \ HVBSEMFUUTFMTF\ SFUVSO ^ QSJOU U ^ G OJM

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*NQMJDJUMZ6OXSBQQFE 0QUJPOBM w *NQMJDJUMZ҉໧త w ͱ͔ Λॻ͔ͳͯ͘΋ɺ҉໧తʹ6OXSBQ͞Ε Δ0QUJPOBMܕͷ͜ͱͰ͢

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*NQMJDJUMZ6OXSBQQFE 0QUJPOBM WBST4USJOHOJM JGTOJM\ QSJOU T ^

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NPOBE w 0QUJPOBMܕʹ͸NBQͱqBU.BQͱ͍͏ϝιου ͕ఆٛ͞Ε͍ͯ·͢ɻ w NBQ͸0QUJPOBMܕม਺͕ඇOJMΛ࣋ͭ৔߹ʹؔ਺ Λద༻͠0QUJPOBMܕͰฦ͠·͢ɻ w qBU.BQ͸0QUJPOBMܕม਺͕ඇOJMΛ࣋ͭ৔߹ʹ ؔ਺Λద༻͠ඇ0QUJPOBMܕͰฦ͠·͢ɻ

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NPOBE WBST4USJOH 999 WBSUTNBQ\ """ ^ QSJOU U UTqBU.BQ\ """ ^ QSJOU U WBSVTNBQ\ 0QUJPOBM4USJOH """ ^ QSJOU V UTqBU.BQ\ 0QUJPOBM4USJOH """ ^ QSJOU U

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࣮૷໘ͷ࿩ w 0QUJPOBM*NQMJDJUMZ6OXSBQQFE0QUJPOBMܕม ਺͸(FOFSJDͰ࣮૷͞Ε͍ͯ·͢ w ΍Λ࢖Θͣ(FOFSJDߏจͰม਺ఆٛ͢Δ͜ ͱ΋ՄೳͰ͢ w 4XJGUʹݶΒͣଞͷݴޠ΋ࣅ༷ͨͳײ͡Ͱ͢

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࣮૷໘ͷ࿩ WBST0QUJPOBM4USJOH""" WBSU*NQMJDJUMZ6OXSBQQFE0QUJPOBM4USJOH"""

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ϓϩάϥϛϯάαϙʔτ w ͜ͷลͰOJMॳظԽΤϥʔͱ͔ग़ͯ͠·͢ w IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFS JODMVEFTXJGU"45 %JBHOPTUJDT4FNBEFG-- w IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFS MJC4FNB$4%JBHDQQ-

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0QUJPO5ZQFͷఆٛ w 0QUJPO5ZQF͸/POF͔4PNF WBMVF Λฦ͢ 5BHHFE6OJPO λά෇͖ڞ༻ମ Ͱ͢ return: A ! A? = a 7! Just a bind: A? ! ( A ! B? ) ! B? = a 7! f 7! ( Nothing if a = Nothing f a0 if a = Just a0

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