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UFO演算子について

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Avatar for Hirofumi Wakasugi Hirofumi Wakasugi
September 11, 2016
Programming
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 UFO演算子について

RubyKaigi 2016 After Party (2016-09-10)

Avatar for Hirofumi Wakasugi

Hirofumi Wakasugi

September 11, 2016

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Transcript

  1. 6'0 ԋࢉࢠ ʹ͍ͭͯ (What's the Story) Spaceship Operator? Hirofumi Wakasugi

    (@5t111111)

  2. ϓϩάϥϚʔ Hirofumi Wakasugi (@5t111111)

  3. 4QBDFTIJQ0QFSBUPS  DMBTT4J[F.BUUFST JODMVEF$PNQBSBCMF EFGJOJUJBMJ[F TUS  !TUSTUS FOE 

    EFG PUIFS  TUSTJ[FPUIFSTUSTJ[F FOE FOE w #BTJDPQFSBUPSGPSDPNQBSJOHUIFSFDFJWFSBHBJOTUBOPUIFSPCKFDU w "MTPLOPXOBTl6'0PQFSBUPSz MFBTUJO+BQBO  w $MBTTFTNJYJOT$PNQBSBCMFNVTUJNQMFNFOU

  4. *NQMFNFOUBUJPOPG w1PTJUJWFOVNCFSJGTFMGJTHSFBUFSUIBOPUIFS w;FSPJGTFMGJTFRVBMUPPUIFS w/FHBUJWFOVNCFSJGTFMGJTMFTTUIBOPUIFS DMBTT'PP ǘ EFG PUIFS  SFUVSOJGTJ[FPUIFSTJ[F

    SFUVSOJGTJ[FPUIFSTJ[F SFUVSOJGTJ[FPUIFSTJ[F FOE FOE GPPGPPUSVFGBMTF *UTIPVMESFUVSO

  5. w :PVDBOXSJUFMJLFUIJTVTJOHJUTJNQMFNFOUBUJPO w -PPLTQSFUUZDPOWFOJFOU EPFTO`UJU "UJQGPSVTJOH DBTF GPPCBS  XIFO

    QVUTGPPJTFRVBMUPCBS XIFO QVUTGPPJTHSFBUFSUIBOCBS FMTF QVUTGPPJTMFTTUIBOCBS FOE

  6. w :PVDBOXSJUFMJLFUIJTVTJOHJUTJNQMFNFOUBUJPO w -PPLTQSFUUZDPOWFOJFOU EPFTO`UJU "UJQGPSVTJOH DBTF GPPCBS  XIFO

    QVUTGPPJTFRVBMUPCBS XIFO QVUTGPPJTHSFBUFSUIBOCBS FMTF QVUTGPPJTMFTTUIBOCBS FOE ʁʁ
 (SFBUFSJGQPTJUJWF  0SMFTTJGQPTUJWF  0SQPTJUJWFJGQPTJUJWF  85'

  7. 4P*BMXBZTEPUIFGPMMPXJOHTUFQTXIFO* XBOUUPVTFDPNQBSJTPOPQFSBUPSTXJUINZ DMBTTFT  *ODMVEFUIFNPEVMFJOBDMBTT  4UBSUXSJUJOHAEFG PUIFS FOEA 

    CFBOHVJTIFEUSZJOHUPSFNJOENFUPJGHSFBUFSMFTT NVTUSFUVSOQPTJUJWFOFHBUJWFOVNCFS  (PPHMJOHGPSBXIJMF  *UEPFTOPUXPSLʜ  6IPI*JODMVEF&OVNFSBCMFJOTUFBEPG$PNQBSBCMF

  8. 4P*UIJOL*NQMFNFOUBUJPOPG FYDFQUJPOBMMZMBDLTEFTDSJQUJWFQPXFS JO3VCZXPSME almost seems like magic numbers

  9. *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

  10. w *UXPVMECFFBTJFSUPLOPXUIFDPEFT`JOUFOTJPO *BNTVSFZPVDBOVTFJGʜFMTJGʜUIPVHI  *XJTI*DPVMEXSJUFMJLF DBTFGPPCBS XIFO&2 QVUTGPPJTFRVBMUPCBS XIFO(5 QVUTGPPJTHSFBUFSUIBOCBS

    FMTF QVUTGPPJTMFTTUIBOCBS FOE

  11. )BTLFMM DMBTT&RB0SEBXIFSF DPNQBSFBB0SEFSJOH EBUB0SEFSJOH-5]&2](5 ADPNQBSFA -5 0SE 0SEFSJOH DPNQBSFSFUVSOT0SEFSJOH 3VTU

    QVCFOVN0SEFSJOH\ -FTT  &RVBM  (SFBUFS  ^ 0SEFSJOH MFUSFTVMUDNQ   BTTFSU@FR 0SEFSJOH-FTT SFTVMU  MFUSFTVMUDNQ   BTTFSU@FR 0SEFSJOH&RVBM SFTVMU  DNQSFUVSOT0SEFSJOH

  12. w 3BOHFVTJOH*/'*/*5:XPVMEXPSLXJUIDBTFFYQSFTTJPO 8IBUJGZPVTJNQMZVTFDPOTUBOUT NPEVMF0SEFSJOH (5'MPBU*/'*/*5: -5'MPBU*/'*/*5: &2 FOE DBTFGPPCBS XIFO0SEFSJOH&2

    QVUTGPPJTFRVBMUPCBS XIFO0SEFSJOH(5 QVUTGPPJTHSFBUFSUIBOCBS XIFO0SEFSJOH-5 QVUTGPPJTMFTTUIBOCBS FOE

  13. w *UEPFTOPUXPSLCFDBVTFPGUIFJSUZQFT w .BZCFJUIBTTPNFPWFSIFBE 8IBUJGUIFTFDPOTUBOUTBSF BWBJMBCMFJOHMPCBMOBNFTQBDFʜ EFG PUIFS  JGTJ[FPUIFSTJ[F

    0SEFSJOH(5 FMTJGTJ[FPUIFSTJ[F 0SEFSJOH&2 FMTF 0SEFSJOH-5 FOE FOE

  14. *BNTVSFJNQMFNFOUBUJPOSFRVJSFNFOU PGMFUTZPVUPXSJUFMJLF EFG PUIFS  TJ[FPUIFSTJ[F FOE *MPWFUIJTBTJUJTDMFBOBOEDPODJTFFOPVHI BTMPOH BTZPVVOEFSTUBOEJUTSFRVJSFNFOUDPSSFDUMZ

  15. w*OBMNPTUBMMDBTFTUIFJNQMFNFOUBUJPOUIBU SFUVSOTOOJTFOPVHIBOEBMTPIBTBEWBOUBHF w.PSFEFTDSJQUJWFPQUJPOTXPVMECFWFSZXFMDPNF FTQFDJBMMZGPSOFXCJFT w*EPO`UIBWFBOZHPPEJEFBTZFU DPOTJEFSJOHJG TJOHMFUPOPCKFDUTMJLFOJMUSVFGBMTFXPSL $PODMVTJPO

  16. 5)"/,:06 w"MM3VCZ,BJHJTUB⒎TBOETQFBLFST w"MMSVCZJTUT*IBWFOFWFSFWFSNFU w XJUIFNQIBTJT %SFDPN3VCZ,BSBPLFXBTKVTU&1*$ ʜBOE!.BLF/PX+VTUGPSHJWJOHNFJOTQJSBUJPO IUUQT HJUIVCDPNDSZTUBMMBOHDSZTUBMQVMM *XPVMEBMTPMJLFUPTBZUIBOLZPVUP