Swift3.0が出る前に 基礎の見直し：guard

Early Exit

Transcript

1. Swift3.0͕ग़Δલʹ جૅͷݟ௚͠ɿguard 2016/07/02 SwiftϏΪφʔζษڧձ ୈ15ճ @ίϫʔΩϯάεϖʔεכ৔ொ Co-Edo
2. • ࣣౡҒ೭ʢͳͳ͠·ͻͰΏ͖ʣ • Repro (ΞϓϦ޲͚෼ੳˍϚʔέπʔϧ) • ΞϓϦ։ൃೖ໳ऀʹ༏͍͠Ωϟϥ
 ʢTeratail / LIGϒϩά / Schooʣ • ੈքҰຊ Coming Soon
3. Swift https://speakerdeck.com/jollyjoester/ swiftfalsepointokaitumami
4. 1೥લ->ࠓճ • let / var : ࠶୅ೖͰ͖Δ͔൱Λ໌֬ʹ෼཭ • struct / class : ঢ়ଶͷ༗ແΛ໌֬ʹ෼཭ • Optional : nil͔஋͋Γ͔Λ໌֬ʹ෼཭ • ɾɾɾ • ʲࠓճʳҟৗܥͱਖ਼ৗܥΛ໌֬ʹ෼཭
5. guard Early Exit A guard statement, like an if statement, executes statements depending on the Boolean value of an expression. You use a guard statement to require that a condition must be true in order for the code after the guard statement to be executed. ཁ͸ifΈ͍ͨͳ΍ͭͬͯ͜ͱͰɻ Excerpt From: Apple Inc. “The Swift Programming Language (Swift 2.1).” iBooks. https://itun.es/jp/jEUH0.l
6. ͦͷ̍ ObjCͰεϚϯ
7. ͦͷ̎ ObjCͰεϚϯ
8. Early Exit ObjCͰεϚϯ
9. Early Exit ωετ΋ݮΔ
10. Early Exit ͬͯReadable Codeઌੜ΋ݴͬͯͨ
11. SwiftͰ΋ͦͷ̍
12. SwiftͰ΋ͦͷ̎ SwiftͰ΋
13. guard SwiftͰ΋
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15. Swift͖ͬͪΓͯͯ͠ॿ͔ΔΘʙ
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