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UFO演算子について
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Hirofumi Wakasugi
September 11, 2016
Programming
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430
UFO演算子について
RubyKaigi 2016 After Party (2016-09-10)
Hirofumi Wakasugi
September 11, 2016
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Transcript
6'0 ԋࢉࢠ ʹ͍ͭͯ (What's the Story) Spaceship Operator? Hirofumi Wakasugi
(@5t111111)
ϓϩάϥϚʔ Hirofumi Wakasugi (@5t111111)
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EFG PUIFS TUSTJ[F PUIFSTUSTJ[F FOE FOE w #BTJDPQFSBUPSGPSDPNQBSJOHUIFSFDFJWFSBHBJOTUBOPUIFSPCKFDU w "MTPLOPXOBTl6'0PQFSBUPSz MFBTUJO+BQBO w $MBTTFTNJYJOT$PNQBSBCMFNVTUJNQMFNFOU
*NQMFNFOUBUJPOPG w1PTJUJWFOVNCFSJGTFMGJTHSFBUFSUIBOPUIFS w;FSPJGTFMGJTFRVBMUPPUIFS w/FHBUJWFOVNCFSJGTFMGJTMFTTUIBOPUIFS DMBTT'PP ǘ EFG PUIFS SFUVSOJGTJ[F PUIFSTJ[F
SFUVSOJGTJ[F PUIFSTJ[F SFUVSOJGTJ[F PUIFSTJ[F FOE FOE GPP GPP USVFGBMTF *UTIPVMESFUVSO
w :PVDBOXSJUFMJLFUIJTVTJOHJUTJNQMFNFOUBUJPO w -PPLTQSFUUZDPOWFOJFOU EPFTO`UJU "UJQGPSVTJOH DBTF GPP CBS XIFO
QVUTGPPJTFRVBMUPCBS XIFO QVUTGPPJTHSFBUFSUIBOCBS FMTF QVUTGPPJTMFTTUIBOCBS FOE
w :PVDBOXSJUFMJLFUIJTVTJOHJUTJNQMFNFOUBUJPO w -PPLTQSFUUZDPOWFOJFOU EPFTO`UJU "UJQGPSVTJOH DBTF GPP CBS XIFO
QVUTGPPJTFRVBMUPCBS XIFO QVUTGPPJTHSFBUFSUIBOCBS FMTF QVUTGPPJTMFTTUIBOCBS FOE ʁʁ (SFBUFSJGQPTJUJWF 0SMFTTJGQPTUJWF 0SQPTJUJWFJGQPTJUJWF 85'
4P*BMXBZTEPUIFGPMMPXJOHTUFQTXIFO* XBOUUPVTFDPNQBSJTPOPQFSBUPSTXJUINZ DMBTTFT *ODMVEFUIFNPEVMFJOBDMBTT 4UBSUXSJUJOHAEFG PUIFS FOEA
CFBOHVJTIFEUSZJOHUPSFNJOENFUPJGHSFBUFSMFTT NVTUSFUVSOQPTJUJWFOFHBUJWFOVNCFS (PPHMJOHGPSBXIJMF *UEPFTOPUXPSLʜ 6IPI*JODMVEF&OVNFSBCMFJOTUFBEPG$PNQBSBCMF
4P*UIJOL*NQMFNFOUBUJPOPG FYDFQUJPOBMMZMBDLTEFTDSJQUJWFQPXFS JO3VCZXPSME almost seems like magic numbers
*USFNJOETNFPGTPNFUIJOHMJLF JOUDPNQBSF@JOU DPOTUWPJE B DPOTUWPJE C \ SFUVSO JOU
B JOU C ^ JOUNBJO \ JOUEBUB<> \ ^ RTPSU EBUB TJ[FPG JOU DPNQBSF@JOU ^ w 0METDIPPM$JTIqBWPS w +BWB DPNQBSF5P /&5 $PNQBSF5P
w *UXPVMECFFBTJFSUPLOPXUIFDPEFT`JOUFOTJPO *BNTVSFZPVDBOVTFJGʜFMTJGʜUIPVHI *XJTI*DPVMEXSJUFMJLF DBTFGPP CBS XIFO&2 QVUTGPPJTFRVBMUPCBS XIFO(5 QVUTGPPJTHSFBUFSUIBOCBS
FMTF QVUTGPPJTMFTTUIBOCBS FOE
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QVCFOVN0SEFSJOH\ -FTT &RVBM (SFBUFS ^ 0SEFSJOH MFUSFTVMU DNQ BTTFSU@FR 0SEFSJOH-FTT SFTVMU MFUSFTVMU DNQ BTTFSU@FR 0SEFSJOH&RVBM SFTVMU DNQSFUVSOT0SEFSJOH
w 3BOHFVTJOH*/'*/*5:XPVMEXPSLXJUIDBTFFYQSFTTJPO 8IBUJGZPVTJNQMZVTFDPOTUBOUT NPEVMF0SEFSJOH (5 'MPBU*/'*/*5: -5 'MPBU*/'*/*5: &2 FOE DBTFGPP CBS XIFO0SEFSJOH&2
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w *UEPFTOPUXPSLCFDBVTFPGUIFJSUZQFT w .BZCFJUIBTTPNFPWFSIFBE 8IBUJGUIFTFDPOTUBOUTBSF BWBJMBCMFJOHMPCBMOBNFTQBDFʜ EFG PUIFS JGTJ[F PUIFSTJ[F
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*BNTVSFJNQMFNFOUBUJPOSFRVJSFNFOU PG MFUTZPVUPXSJUFMJLF EFG PUIFS TJ[FPUIFSTJ[F FOE *MPWFUIJTBTJUJTDMFBOBOEDPODJTFFOPVHI BTMPOH BTZPVVOEFSTUBOEJUTSFRVJSFNFOUDPSSFDUMZ
w*OBMNPTUBMMDBTFTUIFJNQMFNFOUBUJPOUIBU SFUVSOTOOJTFOPVHIBOEBMTPIBTBEWBOUBHF w.PSFEFTDSJQUJWFPQUJPOTXPVMECFWFSZXFMDPNF FTQFDJBMMZGPSOFXCJFT w*EPO`UIBWFBOZHPPEJEFBTZFU DPOTJEFSJOHJG TJOHMFUPOPCKFDUTMJLFOJMUSVFGBMTFXPSL $PODMVTJPO
5)"/,:06 w"MM3VCZ,BJHJTUB⒎TBOETQFBLFST w"MMSVCZJTUT*IBWFOFWFSFWFSNFU w XJUIFNQIBTJT %SFDPN3VCZ,BSBPLFXBTKVTU&1*$ ʜBOE!.BLF/PX+VTUGPSHJWJOHNFJOTQJSBUJPO IUUQT HJUIVCDPNDSZTUBMMBOHDSZTUBMQVMM *XPVMEBMTPMJLFUPTBZUIBOLZPVUP
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![)BTLFMM DMBTT&RB 0SEBXIFSF DPNQBSFB B 0SEFSJOH EBUB0SEFSJOH -5]&2](5 ADPNQBSFA -5 0SE 0SEFSJOH DPNQBSFSFUVSOT0SEFSJOH 3VTU](https://files.speakerdeck.com/presentations/35f30ab551344db887c8e7c50ed48204/slide_10.jpg){kind=link}
