Block_is_everywhere.pdf

Transcript

1. Block is everywhere Event: LegalForce Ruby Meet Up #1 Date: 2019-12-11 Speaker: େ૔խ࢙
2. pp self • ໊લɿେ૔խ࢙ • ॴଐɿϑϦʔϥϯε • ΤσΟλɿVim • Α͍͘ΔίϛϡχςΟɿGrow.rbʢओ࠵ʣɺTama.rbͳͲ
3. RubyͷϒϩοΫ͸ૉ੖Β͍͠
4. RubyͷϒϩοΫͷ࢖ΘΕํ
5. RubyͷϒϩοΫ͕࢖ΘΕ͍ͯΔՕॴ • RailsͷϨΠΞ΢τͷϨϯμϦϯάʢyieldʣ • ֤छgemͷઃఆʢconfigure doʣ • Rake΍FactoryBotʹ୅ද͞ΕΔDSL • Ϧιʔεͷ؅ཧ • ϑοΫͷఆٛ • etc…
6. RailsͷϨΠΞ΢τͷϨϯμϦϯά • ϨΠΞ΢τϑΝΠϧͷதʹ͋Δ”yield”͸࣮͸ϒϩοΫΛධՁ͠ ͍ͯΔ • RailsͷϏϡʔʢςϯϓϨʔτʣ͸࠷ऴతʹ͸Rubyͱ࣮ͯ͠ߦ͞ ΕΔͷͰೖΕࢠΛ࣮ݱ͢ΔͷʹϒϩοΫΛωετ͍ͤͯ͞Δͱ ࢥΘΕΔ • Ұ൪ແҙࣝʹϒϩοΫΛ࢖͍ͬͯΔՕॴͰ͸ʁ
7. ֤छgemͷઃఆ • “configure do |config|”ͱ͔ͷΞϨ͸౰વϒϩοΫΛ࢖͍ͬͯΔ • ίϯϑΟάΦϒδΣΫτʹΞΫηε͢Δͷ͕௚ײతʹͰ͖Δ • ઃఆ͞ΕΔଆ͸”config = Config.new; yield(config)”Έ͍ͨʹ ॻ͚Δ • ࣮͸ϒϩοΫΛ࢖͏ඞཁ͸ͳ͍…ʁ
8. DSL • DSLΛ࣮૷͢ΔͷʹϒϩοΫʢͱ͍͏ΑΓProcΦϒδΣΫτ ͱ”instance_eval”ϝιουʣ͸ඞਢ • RSpecͩͱϒϩοΫΛ࣮ߦ͢Δͨͼʹಗ໊ΫϥεΛ࡞੒͍ͯͨ͠ Γ΋͢Δ • ʮϝλϓϩάϥϛϯάRubyʯͱ͍͏໊ஶΛಡΉͱ࢓૊Έ͕Θ͔Δ
9. Ϧιʔεͷ؅ཧ • “File.open do |f|”͕୅දత • “Net::HTTP.start do |http|”ͳΜ͔΋ͦ͏ • ϝιου͕ϦιʔεΛ࡞੒͠ɺϒϩοΫ͕ด͡ΔͱϦιʔε΋ ด͡ΒΕΔ
10. ϑοΫͷఆٛ • RSpecͷ”before(:each)”΍Railsͷ”before_action”ͳͲ͕୅දత • ϒϩοΫͷத਎ΛProcΦϒδΣΫτͱͯ࣋ͪ͠ճ͢ • aroundܥͷϑοΫ͸಺෦ͰyieldΛݺͿͱຊॲཧ͕૸ΔͷͰೋ ॏʹϒϩοΫΛ࢖͍ͬͯΔ
11. ଞʹ΋৭ʑͳϝιου͕ϒϩοΫΛड͚Δ • Enumerable#countʢϒϩοΫ͕trueͷཁૉΛ਺͑Δʣ • ActiveRecord::Relation#buildʢϒϩοΫ಺ͰΠϯελϯεઃఆʣ • Hash.newʢॳظԽͷํ๏Λنఆʣ • String#gsubʢஔ׵ͷํ๏Λنఆʣ
12. ͓·͚
13. RubyͷϒϩοΫ͸Ϋϩʔδϟ
14. पғͷ؀ڥʹΞΫηεͰ͖ΔͷͰɺ ৭ʑͱϋοΫ͢Δ͜ͱ͕Ͱ͖Δ
15. ྫɿΧ΢ϯλΦϒδΣΫτ