introduce_pattern_matching_with_mongo-clarify

Transcript

1. Introduce Pattern matching with mongo-clarify Hello hey for Engineers vol.3

   @_morihirok

2. About me • Github: morihirok • Twitter: @_morihirok • STORES.jp


   ϓϩμΫτਪਐνʔϜ

3. Ruby 2.7ͷ৽ػೳ Pattern matching͕ ໘നͦ͏

4. 3VCZ,BJHJ
   
   1BUUFSO
   NBUDIJOH
   
   /FX
   GFBUVSF
   JO
   3VCZ
   
   ΑΓҾ༻
   IUUQTTQFBLFSEFDLDPNL@UTKQBUUFSONBUDIJOHOFXGFBUVSFJOSVCZEPU

5. 3VCZ,BJHJ
   
   1BUUFSO
   NBUDIJOH
   
   /FX
   GFBUVSF
   JO
   3VCZ
   
   ΑΓҾ༻
   IUUQTTQFBLFSEFDLDPNL@UTKQBUUFSONBUDIJOHOFXGFBUVSFJOSVCZEPU

6. ࢖ͬͯΈ͍ͨͷͰ Կ͔࡞Ζ͏

7. .POHP%#
   Y
   ΠϯσοΫεੜ੒લޙͷFYQMBJO ݁ՌΛಡΉ
   ΑΓҾ༻
   IUUQTCMPHNLOLJTLDPNNPOHPECJOEFYFYQMBJO

8. MongoDBͷexplain͸ গ͠ಡΈͮΒ͍…

9. MongoDBͷexplain݁Ռͷ αϯϓϧ > db.items.find({price: 119}).explain("executionStats") { "queryPlanner" : { "plannerVersion"

   : 1, "namespace" : "sample_db.items", "indexFilterSet" : false, "parsedQuery" : { "price" : { "$eq" : 119 } }, "winningPlan" : { "stage" : "COLLSCAN", "filter" : { "price" : { "$eq" : 119 } શͯ+40/Ͱදݱ͞ΕΔ

10. ͜ΕΛಡΈ΍͘͢ දࣔͤ͞Δͷʹ Pattern matching͕ ศརͦ͏

11. ͱ͍͏͜ͱͰ࡞ͬͨͷ͕͜Ε FYQMBJOͷ+40/Λ ͍͍۩߹ʹ.BSLEPXOͷ
    ςʔϒϧʹม׵͢Δ

12. ΠϯσοΫε͕ޮ͍ͯͳ͍ͱ͖ͷ explain݁Ռ ͕͜͜z$0--4$"/zʹͳΔ

13. ͜͏ॻ͚Δ ͕͜͜z$0--4$"/zʹͳΔ

14. ΠϯσοΫε͕ޮ͍͍ͯΔͱ͖ͷ explain݁Ռ ͕͜͜z'&5$)zʹมΘΔ ͕͜͜z*94$"/zʹͳΔ ͜͜ʹΠϯσοΫε໊͕ೖΔ

15. ͜͏ॻ͚Δ ͕͜͜z'&5$)zʹมΘΔ ͕͜͜z*94$"/zʹͳΔ ͜͜ʹΠϯσοΫε໊͕ೖΔ

16. ͜͏ॻ͚Δ ม਺ΛόΠϯυͰ͖Δ ͜͜ʹΠϯσοΫε໊͕ೖΔ

17. ࠷ऴతʹ͸͜͏ͳΔ

18. STORES.jpͰ΋ ͍͍ײ͡ʹ࢖͑ͦ͏

19. ໰୊ൃੜ

20. Ruby 2.7(trunk)͡Όͳ͍ͱ ࢖͑ͳ͍

21. Pattern matchingແ͠Ͱ ॻ͖׵͑Δ

22. Pattern matchingແ͠Ͱ ॻ͖׵͑Δ

23. কདྷతʹ ॏๅ͞Εͦ͏ͳ༧ײ

24. ࠓ೔ͷίʔυ͸ͪ͜Β͔Β IUUQTHJUIVCDPNNPSJIJSPLNPOHPDMBSJGZ