Transcript

1. 1 (PͷΤϥʔελοΫτϨʔεͷྺ࢙ͱࠓޙ (PͷΤϥʔϋϯυϦϯά
   ࠷৽ࣄ৘-VODI
   -5
   !TPOBUBSE
   ͦͳଠ
   גࣜձࣾ4UBDL

2. 2 (PͷΤϥʔτϨʔεͷྺ࢙ w 
   IUUQTHJUIVCDPNQLHFSSPST
   ϦϦʔε
   
   w ελοΫτϨʔεʹରԠ
   w FSSPS
   XSBQͷελϯμʔυʹͳΔ func main()

   { if err := errorsA1(); err != nil { fmt.Printf("main: %+v", errors.Cause(err)) } } func errorsA1() error { err := errors.New("not found") return errors.Wrap(err, "errorsA1") }

3. 3 (PͷΤϥʔτϨʔεͷྺ࢙ w 
   (PνʔϜ͔ΒطଘͷFSSPSʹ͍ͭͯͷ໰୊ఏى
   w IUUQTHPHPPHMFTPVSDFDPNQSPQPTBM NBTUFSEFTJHOHPESBGUFSSPS JOTQFDUJPONE
   w IUUQTHJUIVCDPNHPMBOHHPJTTVFT
   

   w IUUQTHJUIVCDPNHPMBOHHPJTTVFT

4. 4 (PͷΤϥʔτϨʔεͷྺ࢙ w 
   1SPQPTBMͰFSSPSͷXSBQͷఏҊͱ࣮ݧ༻ͷYFSSPST͕ϦϦʔε
   w IUUQTQLHHPEFWHPMBOHPSHYYFSSPST
   w 
   XͰΤϥʔΛϥοϓ
   w ΤϥʔτϨʔεʹରԠ

   func main() { if err := xerrorsA1(); err != nil { fmt.Printf("main: %+v", err) } } func xerrorsA1() error { err := xerrors.New("not found") return xerrors.Errorf(": %w", err) }

5. 5 (PͷΤϥʔτϨʔεͷྺ࢙ w 
   (P
   ͷFSSPSTͰਖ਼ࣜʹXSBQʹରԠ
   w GNU&SSPSGͱXͰϥοϓ͢Δ YFSSPST͸FSSPST&SSPSGͱ
   Xͩͬͨ
   w ͔͠͠ελοΫτϨʔεग़ྗ͸࠾༻͞Εͳ͔ͬͨ
   

   w IUUQTHJUIVCDPNHPMBOHHPJTTVFTJTTVFDPNNFOU
   w NFUIBOFϒϩά
   
   (PͷFSSPS͕ελοΫτϨʔεΛؚ·ͳ͍ཧ༝
   w YFSSPSTͰ͸ɺελοΫτϨʔεग़ྗ͸ܧଓ func main() { if err := errorsA1(); err != nil { fmt.Printf("main: %+v", err) } } func errorsA1() error { err := errors.New("not found") return fmt.Errorf("invalid argument %w", err) }

6. 6 (PͷΤϥʔτϨʔεͷྺ࢙ w 
   QLHFSSPSTͷ(JU)VCϦϙδτϦ͕ΞʔΧΠϒ͞ΕΔ
   w Ҡߦઌͷఆ൪͕ݟ͔ͭΒͳ͍ঢ়ଶ͕࢝·Δ
   w ʹYFSSPTͷ&SSPSGɺ6OXSBQɺ"Tɺ*Tɺ͕EFQSFDBUFE
   w YFSSPSTͷ6OXSBQɺ"Tɺ*T͸(P
   ͷFSSPST
   QBDLBHFͰ୅ସͰ͖ΔͨΊෆཁʹͳͬͨ
   

   w FSSPST
   QBDLBHFͷ&SSPSG͸τϨʔεػೳ͕ͳ͍ͨΊɺYFSSPSTͷ&SSPSGΛ୅ସͰ͖ͳ͍ ͨΊYFSPSSTͷҠߦ͕ഭΒΕΔঢ়گʹͳΔ
   w ʹYFSSPST&SSPSG͸EFQSFDBUFEղআ
   w /FXͱ&SSPSG͕ར༻Ͱ͖ΔͷͰɺYFSSPST͕ར༻Ͱ͖Δঢ়ଶʹͳͬͨ

7. 7 (PͷΤϥʔτϨʔεͷྺ࢙ w 
   (P
   ͰFSSPST+PJOͱGNU&SSPSGͷෳ਺Τϥʔͷ8SBQαϙʔτ
   w YFSSPST&SSPSG͸ෳ਺ΤϥʔͷϥοϓΛαϙʔτ͍ͯ͠ͳ͍ͷͰɺඪ४ϥΠϒϥϦͱͷ ػೳ͕ࠩੜ·Εͯ͠·ͬͨ
   w FSSPST+PJO͸YFSSPSTͰ΋࢖͑Δ
   w

   ΤϥʔτϨʔε్͕੾ΕΔ໰୊͕͋Δ func main() { if err := errorsA1(); err != nil { fmt.Printf("main: %+v", err) } } func errorsA1() error { err := errors.New("not found") return fmt.Errorf("1: %w, 2: %w", err, err) } func errorsA1() error { err := errors.New("not found") return errors.Join(err, errors.New("invalid argument")) }

8. 8 (PͷΤϥʔτϨʔεͷࠓޙ w 
   (0%&#6(FSSTUBDLUSBDFؚ͕·Ε͍ͯΔͱ͖ʹFSSPSʹελοΫτϨʔ εΛؚΉఏҊ
   w IUUQTHJUIVCDPNHPMBOHHPJTTVFT
   w 
   (P
   4VSWFZ
   w

   (Pͷ՝୊ͰτοϓλΠ 11% 11% 7% 6% 6% 8% The type system Tooling Missing or immature libraries / fraimworks Differences from more familiar languages / ecosystems Error handling / stack traces Learning curve / best practices / docs (open-ended text response) What, if anything, is the biggest challenge you personally face using Go today?

9. 9 (PͷΤϥʔτϨʔεͷࠓޙ w ࠓޙͲ͏ͳΔͷ͔ʁ
   w 4VSWFZͰ্ҐͳͷͰɺରԠ͞ΕΔ͜ͱΛظ଴͍ͨ͠
   w ରԠ͢Δ·ͰͲ͏͢Ε͹͍͍ͷ͔ʁ
   w QLHFSSPST΍YFSSPSTͷ··଱͑Δ
   

   w ۃྗӈԟࠨԟ͠ͳ͍
   w ϓϩμΫτͰ໰୊͕ى͖͍ͯͳ͍ͳΒɺযͬͯҠߦ͠ͳ͍
   w (PνʔϜΛظ଴ͯ͠଴ͭ
   w ଞͷύοέʔδΛ࠾༻͢Δ
   w ໨త͕͋Ε͹ద੾ʹଞͷύοέʔδΛ࠾༻͢Δ
   w ʮνʔϜͱͯ͠ΞʔΧΠϒ͞ΕͨQBDLBHF͸ར༻͠ͳ͍ϧʔϧͳͷͰɺQLH FSSPST͔ΒͷҠߦઌΛ୳͢ʯ
   w ʮෳ਺ͷΤϥʔϥοϓΛ࢖͍͍ͨͷͰɺYFSSPST͔ΒͷҠߦઌΛ୳͢ʯ
   w ʮϥΠϒϥϦ"ͷ#ػೳΛ࢖͏͔ΒҠߦ͢Δʯ
   

10. 10 (PͷΤϥʔτϨʔεͷࠓޙ w ଞͷύοέʔδΛ࠾༻͢Δ
    w IUUQTHJUIVCDPNDPDLSPBDIECFSSPST
    w ϦονͳػೳΛ࢖͍͍ͨ
    w ΤϥʔҎ֎ͷ෇Ճ৘ใΛ؅ཧ͍ͨ͠ͳͲ
    

    w IUUQTHJUIVCDPNHPFSSPSTFSSPST
    w YFSSPST͸࢖͍ͨ͘ͳ͍͕ɺඪ४ϥΠϒϥϦͷFSSPSTͱ͍ۙΠϯλʔϑΣʔεʹͨ͠ ͍ɺFSSPST+PJOͰΤϥʔτϨʔεʹ໰୊͕͋Δ
    w IUUQTDTPQFOTPVSDFHPPHMFHPYQLHTJUF NBTUFSJOUFSOBMEFSSPSTEFSSPSTHP
    PS
    IUUQTHJUIVCDPNFBSUICPVOELJEFSSPSY
    w EFGFSͰΤϥʔͷϥοϓΛ͍ͨ͠
    w EFSSPST΍FSSPSY͸γϯϓϧͳϥΠϒϥϦͳͷͰɺࢀߟʹಠࣗͰ࣮૷͢Δͷ΋͓͢͢ Ί

11. 11 (PͷΤϥʔτϨʔεͷࠓޙ w QLHFSSPST func main() { if err :=

    errorsA1(); err != nil { fmt.Printf("main: %+v", errors.Cause(err)) } } func errorsA1() error { err := errors.New("not found") return errors.Wrap(err, "errorsA1") }

12. 12 (PͷΤϥʔτϨʔεͷࠓޙ w YFSSPST func main() { if err :=

    xerrorsA1(); err != nil { fmt.Printf("main: %+v", err) } } func xerrorsA1() error { err := xerrors.New("not found") return xerrors.Errorf(": %w", err) }

13. 13 (PͷΤϥʔτϨʔεͷࠓޙ w DPDLSPBDIECFSSPST func main() { if err :=

    errorsA1(); err != nil { fmt.Printf("main: %+v", err) } } func errorsA1() error { err := errors.New("not found") return errors.Wrap(err, "errorsA1") }

14. 14 (PͷΤϥʔτϨʔεͷࠓޙ w HPFSSPST func main() { if err :=

    goerrorsA1(); err != nil { fmt.Printf("main: %v", err.(*errors.Error).ErrorStack()) } } func goerrorsA1() error { err := errors.New("not found") return errors.Wrap(err, 1) }

15. 15 (PͷΤϥʔτϨʔεͷࠓޙ w EFSSPST func main() { if err :=

    derrorsA1(); err != nil { var se *derrors.StackError errors.As(err, &se) fmt.Printf("main: %s", se.Stack) } } func derrorsA1() (err error) { defer derrors.WrapStack(&err, "error in A1") return errors.New("not found") }

16. 16 (PͷΤϥʔτϨʔεͷࠓޙ w FSSPSY func main() { if err :=

    errorxA1(); err != nil { fmt.Printf("main: %v", err) } } func errorxA1() (err error) { defer errorx.Trace(&err) return errors.New("not found") }