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Koichi ITO
November 21, 2025
Programming
0
420
STYLE
北陸Ruby会議01 (
https://regional.rubykaigi.org/hokuriku01
)
Koichi ITO
November 21, 2025
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Transcript
45:-& ,PJDIJ*50&4. *OD 3VCZձٞ ੴݝཱਤॻؗ
w044ϓϩάϥϚʔ w3VCP$PQίΞνʔϜίϛολʔ w.$1TUFFSJOHHSPVQϝϯόʔ</&8> wגࣜձࣾӬγεςϜϚωδϝϯτ &4. *OD ΤϯδχΞϦϯάϚωʔδϟʔ σΟεςΟϯάΠογϡυɾΤϯδχΞ @koic
w 3VCZ,BJHJ দࢁ w 4DSVN'FTU0TBLB େࡕ w ͳ͕Β3VCZձٞ
ذෞ w 3VCZ8PSME$POGFSFODF দߐ w 3VCZձٞ ۚ &4.ೖࣾपπΞʔϑΝΠφϧ
None
3VCZձٞͷӬϝϯόʔ 4 Q FBLFS -5 4 Q FBLFS !LPJD !ZPTIJOP
!UBJKV !GVHBLLCO !KVOL !OTHD !NBJNVYY !LBTVNJQPO !XBJEPJ !IBNDBQ 4 Q POTPS 5BML 4 Q FBLFS !N@QJYZ " UUFOEFF " UUFOEFF " UUFOEFF " UUFOEFF " UUFOEFF " UUFOEFF " UUFOEFF
wਓੜͷঢ়گʹ͋Θͤͨ ϥΠϑελΠϧΛଚॏ͢Δ wؔ౦ݍɺҪɺ࣎լɺژ Վࢁɺౡࠜɺٶ࡚͔Βͷ ϦϞʔτϫʔΫ 🗾 ಇ͖ํͷଟ༷Խͱ࠾༻ํ ઈࢍɺશࠃ࠾༻தʂݱࢀՃϝϯόʔ·Ͱ͓ؾܰʹֻ͓͚͍ͩ͘͞ʂ
w มԽͷ͍--.पลٕज़ʹ͍ͭͯͷ w ༧ࢉͷ͍ͭͨ෦׆ಈ w Ӭࣾ4MBDLͷMMNDMVCνϟϯωϧ w ઈࢍ෦һืूத w ೖࣾ͢Δ͚ͩͰɺΕͳ͘ೖ෦Ͱ͖·͢
େنݴޠϞσϧ --. ݚڀ෦
ࠓͷ
IUUQTSFHJPOBMSVCZLBJHJPSHIPLVSJLV
None
IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTEPZPVMPWF
IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTGSVTUSBUFZPVUIFNPTU
3VCP$PQ
45:-& ࠓܺؒͷ͋ΔΛ͖࣋ͬͯ·ͨ͠
͋ͳͨͷ Έʁ
จࣈྻϦςϥϧ require 'csv' γϯάϧΫΥʔτ μϒϧΫΥʔτ require "csv" w ॻ͘ͱ͖͍͚Λ ߟ͑ͳͯ͘ྑ͍
w JOTQFDUͷ݁Ռ μϒϧΫΥʔτ͔ͩΒ w ࣜల։ಛघจࣈ͕ ͳ͍͜ͱ͕໌֬ʹͳ Δ
)BTIϦςϥϧͷׅހͷۭന {key: value} ۭനͳ͠ ۭന͋Γ { key: value } w
Α͘ݟ͖ͯͨίʔυ ͕ͦ͏͔ͩΒ w ۭന͋Γͷ1SPDͱ ҟͳΔͷ͔ͩΒ w ྻϦςϥϧͱಉ༷ ʹۭനͳ͠
ྻϦςϥϧͷׅހͷۭന [first, second, third] ۭനͳ͠ ۭന͋Γ [ first, second, third
] w )BTIϦςϥϧͰ ۭന͋Γ͔ͩΒ SVCPDPQSBJMTPNBLBTF w )BTIϦςϥϧͰ ۭനͳ͔ͩ͠Β w Α͘ݟ͖ͯͨίʔυ ͕ͦ͏͔ͩΒ
ϒϩοΫͷ\^ͱEPFOE expression { foo } ηϚϯςΟοΫ ߦΧϯτ w ࣜ\^ͰจEPFOEͱ͍͚ w
EPFOEDIBJOFOE͍ͯ͠ͳ͍ w େߐށ3VCZձٞͰEPFOEͷ ՃΛੴ௩ܡथ͞Μ͕ޠΔ expression do foo end w ୯Ұߦͷͱ͖\^Ͱෳߦͷͱ͖ EPFOE w Α͘ݟ͖ͯͨίʔυ͕ͦ͏͔ͩΒ w ॳ৺ऀʹ͍͚͍ͩ͢͠Ζ͏ ͑ʔ statement do foo end ࣜ จ ෳߦ
ϒϩοΫ͖ϝιουνΣʔϯͷվߦ foo { bar } .baz .qux ߦ಄ ߦ w
৽ͨͳϝιουνΣʔϯΛ૿ ͢ͱ͖EJ ff ͕࠷খʹͳΓ͏Δ w υοτ͕ἧ͏ foo { bar }. baz. qux w ߦ͕ଓ͘͜ͱ͕ͦͷ ߦͰΘ͔Δ
ϒϩοΫ͖ϝιουνΣʔϯͷվߦ foo { bar }.baz.qux ϒϩοΫͰվߦ w ͦͦυοτͰվߦ͠ͳ ͍ w
Πϯσϯτͷσσϯτ
)BTIϦςϥϧͷඌΧϯϚ { foo: one, bar: two } ͳ͠ ͋Γ w
ࢹ֮తɺ࣮࣭తʹ ΤϯτϦ͕ଓ͘Θ͚ Ͱͳ͍ͷͰෆཁ w ࠷ޙͷཁૉͷޙΖ ΤϯτϦՃ࣌ʹEJ f ͕࠷খʹͳΔ { foo: one, bar: two, }
45:-& Έ
ଟ༷ੑ
ʮԶୡΑ͘ʰۂ͕όϥ όϥͩͶʱͱݴΘΕΔ͚ ͲɺԿͰόϥόϥͩͱ͍ ͚ͳ͍ͷ͔ɻ͔ͩΒൽ ʹʰόϥόϥͳͷ͕Զ ୡͷελΠϧͰ͢ʱͱݴ ͑ͨΒͱࢥͬͨʯ + ʮ45:-&ʯͷઌഐʹֶͿ IUUQTKBXJLJQFEJBPSHXJLJ45:-&@
-6/"@4&"ͷΞϧόϜ -6/"4&"ʮ45:-&ʯ
ͭ·ΓΦϨ ͨͪͰʁ
3VCP$PQͷ ͍ͮΒ͞୳Δ
Λ౿·͑ͨެֶࣜ IUUQTEPDTSVCPDPQPSHSVCPDPQJOEFYIUNMQIJMPTPQIZ
w 3VCP$PQ3VCZ4UZMF(VJEFͷϥϯλΠϜ࣮ w ॳظʹࢦͨ͠ͷHPGNUతͳେ౷ҰϑΥϚολʔ w 3VCZίϛϡχςΟʹڝ߹͢ΔελΠϧΈ͕͋Δ͜ ͱʹؾͮ͘ FHμϒϧΫΥʔτɺγϯάϧΫΥʔτ w
ҰൠతͳελΠϧΛߏՄೳʹ͢ΔΑ͏ʹͳΔ w ελΠϧΨΠυΛσϑΥϧτͱͭͭ͠ɺΈͷҧ͍Λड ͚ೖΕΔͱ͍͏ֶʹجͮ͘Α͏ʹͳΔ 3VCP$PQͷֶαϚϦʔ
w ࣮͍ͮΒ͍ͷϓϩδΣΫτ͝ͱʹى͖ ΔελΠϧͷҧ͍͕ຊ࣭Ͱͳ͍ͷͰʁ w ࠷SVCPDPQEJTBCMFͰແޮԽ͢ΔDPQΛ ߟ͑ͯΈΑ͏ w ࢥ͍ු͔ͼ·͔ͨ͠ʁ ελΠϧͷҧ͍Λड͚ೖΕΔલఏͱ͢Δ
.FUSJDT"CD4J[F
w .FUSJDT"CD4J[F3VCP$PQࣗઃఆͰ σϑΥϧτ͔ΒᮢΛ্͍͛ͯΔ w .FUSJDTܥͷDPQ༑ୡͷ.FUSJDTܥDPQΛ ࿈Εͯͬͯ͘Δ w .FUSJDTͷ"CD4J[F 1FSDFJWFE$PNQMFYJUZ
$ZDMPNBUJD$PNQMFYJUZͷίϯϏωʔγϣϯ .FUSJDTͷσϑΥϧτݫ͗͢͠Δ
# .rubocop.yml Metrics: Enabled: false ઈରతͳઃఆͱ͍͏Θ͚Ͱͳ͘ɺखૣ͍͍ͮΒ͞؇ͷͨΊͷҰྫͰ͢
*BNUIFUSJHHFS 8PSET(PE0OMZ,OPXT XPOUXPSLGPSNF -6/"4&"ʮ.05)&3ʯ
#VUTUJMMTFBSDIGPSMJHIU IUUQTHJUIVCDPNSVCPDPQSVCPDPQJTTVFTJTTVFDPNNFOU
l ίϛϡχςΟͱ୭͔ɻͪΖΜɺ͋ ͳͨͷ͜ͱͩɻ͋ͳ͕ͨίϛϡχςΟ Ͱ͋ΓɺͦΕҎ֎ʹίϛϡχςΟ ͍ͳ͍ɻ͋ͳͨͷΑ͏ͳਓʑͷू·Γ ΛɺίϛϡχςΟͱݺͿͷͩɻ IUUQTNBHB[JOFSVCZJTUOFUBSUJDMFT'PSF8PSEIUNM