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Swiftをキめると 気持ちいい!
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Takaaki Tanaka
July 26, 2016
Technology
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Swiftをキめると 気持ちいい!
AKIBAswift #04での資料です
Takaaki Tanaka
July 26, 2016
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Transcript
4XJGUΛΩΊΔͱ ؾ͍͍࣋ͪʂ AKIBA.swift #04
About Me • ాத ໌ (Takaaki Tanaka) • Ϋϥεϝιουגࣜձࣾ •
@kongmingtrap • iOS Developer (Swift / Objective-C) • GyazSquare / GitHub
օ༷
4XJGUॻ͍͍ͯ·͔͢ʁ
0CKFDUJWF$͔Βೖ͖ͬͯͨํʑ
πϥ͘ͳ͍Ͱ͔͢ʁ
πϥ͔ͬͨͰ͢ɻ
ͦΕ͔Βɻɻɻ৭ʑ͋Γɻɻɻ
ศརͳؔΛͬͯ ؆ܿʹॻ͘Α͏ʹ͢Δ͜ͱͰ ॻ͘ͷָ͕͘͠ͳ͖ͬͯ·ͨ͠ɻ
ศརͳؔ w GPS&BDI w NBQ w SFEVDF w pMUFS w
qBUNBQ
ศརͳؔ w GPS&BDI w NBQ w SFEVDF w pMUFS w
qBUNBQ
NBQqBUNBQ w 0QUJPOBM w 4FRVFODF5ZQF w $PMMFDUJPO w 'MBU.BQ ద༻͞Ε͍ͯΔऀͨͪ
NBQqBUNBQ public func map<U>( _ transform: @noescape (Wrapped) throws ->
U ) rethrows -> U? { switch self { case .some(let y): return .some(try transform(y)) case .none: return .none } }
ࡉ͔͍આ໌ল͍ͯޙʹͯͬͯ͠ΈΑ͏
NBQqBU.BQͰ ಈ࡞ΛൺͯΈΔ
&YBNQMF enum PokemonType: String { case Grass = "Grass" case
Water = "Water" case Fire = "Fire" case Electric = "Electric" } ͋Δ࣌͜Μͳ&OVN͕͓Γ·ͨ͠ɻ
4FRVFODF let types = ["Grass", "Water", "Fire", "Electric"] let pokemonTypes
= types.map { PokemonType(rawValue: $0) } [Optional PokemonType.Grass Optional PokemonType.Water Optional PokemonType.Fire Optional PokemonType.Electric ] ݁Ռ͕0QUJPOBMʹͳΔ
4FRVFODF let types = ["Grass", "Water", "Fire", "Electric"] let pokemonTypes
= types.flatMap { PokemonType(rawValue: $0) } [PokemonType.Grass PokemonType.Water PokemonType.Fire PokemonType.Electric] ݁Ռ͕VOXSBQ͞ΕΔ
4FRVFODF let types = ["Grass", "Water", "Fire", "Ice"] let pokemonTypes
= types.map { PokemonType(rawValue: $0) } [Optional PokemonType.Grass Optional PokemonType.Water Optional PokemonType.Fire nil] ۪ʹ݁ՌΛฦ͢
4FRVFODF let types = ["Grass", "Water", "Fire", "Ice"] let pokemonTypes
= types.flatMap { PokemonType(rawValue: $0) } [PokemonType.Grass PokemonType.Water PokemonType.Fire] ݁Ռ͕VOXSBQ͞ΕɺOJM͕ଧͪফ͞ΕΔ
$PMMFDUJPO let types1 = ["Electric", "Electric", "Fire"] let types2 =
["Water", "Ice"] let types3 = ["Fire", "Grass", "Rock", "Grass"] let types = [types1, types2, types3].map { $0 } [["Electric", "Electric", "Fire"], ["Water", "Ice"], ["Fire", "Grass", "Rock", "Grass"]]
$PMMFDUJPO let types1 = ["Electric", "Electric", "Fire"] let types2 =
["Water", "Ice"] let types3 = ["Fire", "Grass", "Rock", "Grass"] let types = [types1, types2, types3].flatMap { $0 } ["Electric", "Electric", "Fire", "Water", "Ice", "Fire", "Grass", "Rock", "Grass"] ݁Ռ͕qBUͳ"SSBZʹͳΔ
$PMMFDUJPO let types1 = ["Electric", "Electric", "Fire"] let types2 =
["Water", "Ice"] let types3 = ["Fire", "Grass", "Rock", "Grass"] let types = [types1, types2, types3].flatMap { $0 }.flatMap { PokemonType(rawValue: $0) } [PokemonType.Electric PokemonType.Electric PokemonType.Fire PokemonType.Water PokemonType.Fire PokemonType.Grass PokemonType.Grass] OJM͕ଧͪফ͞ΕΔͨΊɺཉ͍͠σʔλ͚ͩΔ
0QUJPOBM let value: String? = "Fire" let value1 = value.map
{ PokemonType(rawValue: $0) } Optional Optional PokemonType.Fire ݁Ռ͕ೋॏͷ0QUJPOBMʹͳΔ
0QUJPOBM let value: String? = "Fire" let value1 = value.flatMap
{ PokemonType(rawValue: $0) } Optional PokemonType.Fire ݁Ռͷ0QUJPOBM͕ଧͪফ͞ΕΔʢVOXSBQ͞ΕΔʣ
0QUJPOBM let type = PokemonType(rawValue: "Water") let changedType = pokemon.map
{ type -> PokemonType in switch type { case .Water: return PokemonType.Electric default: return type } } Optional PokemonType.Electric VOXSBQͯ͠ΛऔΓѻ͏
0QUJPOBM let value1: Int? = 10 let value2: Int? =
20 let value = value1.flatMap { v1 in value2.map { v2 in v1 + v2 } } Optional 30 0QUJPOBMಉ࢜ͷͷܭࢉ
·ͱΊ w ؆ܿʹॻ͜͏ w 0QUJPOBMͱྑ͖͘߹͓͏ w 1MBZHSPVOEΛ༗ޮ׆༻͠Α͏
5IBOL:PV