Mobile Programming Control Flow 2

MobileProgrammingの授業で使うスライドです！

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1. ੍ޚߏจ2 MOBILEPROGRAMMING OCT, 15TH
2. ςΩετ ੍ޚߏจʂ ▸ if΍for-inͳͲ෼ذ΍܁Γฦ͠ॲཧΛಛఆͷจʹߏ଄Խͨ͠΋ͷ ▸ ϓϩάϥϜͷߏ଄͸ ॱ࣍ɺબ୒ɺ൓෮ͷࡾͭʹ෼ྨ͞ΕΔ ▸ ͜ΕΒΛ૊Έ߹Θͤͯϓϩάϥϛϯά͢Δํ๏Λߏ଄Խϓϩάϥ ϛϯάͱݺͿ ▸ ࠓճ͸܁Γฦ͠ͷߏจʹߜͬͯ΍ͬͯߦ͖·͢ ▸ ݴޠʹΑͬͯ͸for΍whileͱ͍͏ߏจ͕ଘࡏ͠ͳ͍(or ͨͩͷγ ϯλοΫεγϡΨʔ)
3. 1. FOR-IN
4. ςΩετ FOR-INจ ▸ ܁Γฦ͠ॲཧΛ͢Δͱ͖ͷجຊతͳߏจ ▸ ߏจ͸ for <ม਺> in <Array or Range> { /* loop */ } ▸ Լهͷforͱ۠ผ͢ΔͨΊʹ for-inͱݺ͹Ε·͢ ▸ for (int i = 0; i <= 10, i++) { /* loop */ } ▸ ͷΑ͏ͳߏจ͸Swift 3.0 Ҏ߱ഇࢭ͞Ε·ͨ͠ ▸ ͜ͷΑ͏ͳforจΛC-style forͱݺͼ·͢ ▸ forจ͸ಛఆͷճ਺܁Γฦ͠ॲཧΛ͍ͨ͠ͱ͍͏Α͏ͳ৔߹ʹΑ͘࢖͍·͢
5. ςΩετ ͳΜͰC-STYLE FOR ͸ফ͑ͨʁ ▸ ؆ܿʹ͍͏ͱSwiftΒ͘͠ͳ͍͔Β ▸ CݴޠܦݧऀҎ֎ʹ͸Θ͔Γʹ͍͘͠ ▸ ॳΊͯSwiftΛֶͿਓʹͱͬͯ͸֮͑ʹ͍͘ ▸ ΠϯΫϦϝϯτɺσΫϦϝϯτʹΑΔ໰୊΋͋Δ͠ for (let i = 0; i <= 10; i++) { // loop... for (let j = 0; j <= 10;, i++) { print("it's a infinity loop!") } }
6. Ͱ͸Ͳ͏΍ͬͯ ϧʔϓͤ͞Δʁ
7. 1-1.RANGE
8. ςΩετ RANGE(ൣғԋࢉࢠ)Λ࢖͏ ▸ Ұ൪؆୯ͳ΍Γํ ▸ switchͷ࣌ʹग़͖ͯͨΑ͏ʹ 0…10 ͱͯ͠ 0 ~ 10·Ͱͷ Sequence(Array)Λ࡞੒ ▸ ͦΕΛfor-inͱ૊Έ߹ΘͤΔ // Range let range = 0...10 for number in range { print("number: \(number)") }
9. ςΩετ FOR-IN STLIDE ▸ for-inͱ stlide Λ࢖༻͢Δ͜ͱͰִؒΛ։͚ͯϧʔϓͤ͞Δ ͜ͱ͕Ͱ͖·͢ // 0͔Β10·ͰೋͭͱͼͰϧʔϓ for number in stride(from: 0, to: 10, by: 2) { print("number: \(number)") }
10. 1-2. ARRAY
11. ςΩετ ARRAYΛ࢖͏ ▸ ͜Ε΋ඇৗʹΦʔιυοΫεͳ΍Γํ ▸ ఆٛࡁΈͷarrayʹରͯ͠for-inΛ࢖͏ ▸ indexͰΞΫηε͢Δํ๏ʹൺ΂ Array ͷൣғ֎ʹΞΫηε ͯ͠͠·͏͜ͱ͕ͳ͍ͨΊ҆શ // Array let array = ["sunday", "monday", "tuesday", "wednsday", "thursday", "friday", "Saturday"] for number in array { print("number: \(number)") }
12. 1-3.DICTIONARY
13. ςΩετ DICTIONARYΛ࢖͏ ▸ ͜Ε΋ׂͱΦʔιυοΫεͳ΍Γํ ▸ ఆٛࡁΈͷdictionaryʹରͯ͠for-inΛ࢖͏ ▸ key, value ͷܗʹͳ͍ͬͯΔͨΊ for ͷҾ਺͸ೋͭʹͳΔ // Dictionary let dic = ["Animal": "Cat", "Fruit": "Banana"] for (key, value) in dic { print("key: \(key)") print("value: \(value)") }
14. 2. WHILE
15. ςΩετ WHILEจ ▸ ܁Γฦ͠ॲཧΛ͢Δͱ͖ͷجຊతͳߏจ ▸ ߏจ͸ while <ϧʔϓ৚݅> { /* loop */ } ▸ whileจ͸ಛఆͷ৚݅ʹϚον͢Δ·Ͱ܁Γฦ͠ॲཧΛͨ͠ ͍࣌ʹ࢖͏ var count = 0 var total = 0 while count < 5 { count += 1 total += count } print("count: \(count) total: \(total)")
16. 3. ੍ޚసૹ
17. ςΩετ ੍ޚసૹ(CONTROL TRANSFER STATEMENTS)ʁ ▸ ੍ޚసૹ(Control Transfer Statements)͸ϓϩάϥϜͷॲཧ ΛΛ͋Δ৔ॴ͔Βผͷ৔ॴʹҠ͢ػೳͷ͜ͱ ▸ ྫ͑͹continue ΍ break, switchͷfallthroughͳͲ͕͋Δ ▸ ؔ਺ͷreturn΍ Τϥʔॲཧʹग़ͯ͘Δ throw ΋ಉ͡ ▸ ࠓճ͸breakͱcontinueʹߜ͓ͬͯ࿩Λ͠·͢
18. 3-1.BREAK
19. ςΩετ BREAK ▸ ଞͷݴޠಉ༷Swiftʹ΋ break ͕͋Γ·͢ ▸ ಛఆͷ৚݅ͷ࣌ʹϧʔϓ͔Βൈ͚͍ͨ৔߹ʹbreakΛ࢖༻͠ ·͢ for i in 0...10 { // 11ճϧʔϓͤ͞·͢ɻ if i >= 3 { // i ͕ 3 Ҏ্ʹͳͬͨͱ͖ʹൈ͚Δ break } print(i) }
20. 3-2. CONTINUE
21. ςΩετ CONTINUE ▸ ଞͷݴޠಉ༷Swiftʹ΋ continue ͕͋Γ·͢ ▸ ಛఆͷ৚݅ͷ࣌ʹॲཧΛεΩοϓ͍ͨ͠৔߹͸continueΛ࢖ ༻͠·͢ ▸ breakͱ͸ҧ͍loopΛൈ͚Δ͜ͱ͸͋Γ·ͤΜ for i in 0...10 { if i % 3 == 0 { // 3ͷഒ਺ͷ࣌͸εΩοϓ continue } print(i) }
22. ͓·͚
23. ςΩετ FOR΍WHILEΛ࢖Θͳ͍ʁ ▸ ๯಄Ͱগ͓͠࿩ͨ͠௨ΓݴޠʹΑͬͯ͸for΍while͕ଘࡏ͠ ͳ͍Ͱ͢ ▸ Ͱ͸Ͳ͏΍ͬͯ܁Γฦ͠Λදݱ͢ΔͷͰ͠ΐ͏͔ʁ ▸ ํ๏͸͍͔ͭ͋͘ΓҰͭ͸ߴ֊ؔ਺Λ࢖͏ํ๏ ▸ ΋͏Ұͭ͸࠶ؼؔ਺Λ࢖͏ํ๏Ͱ͢
24. ͓·͚: ߴ֊ؔ ਺
25. ςΩετ ߴ֊ؔ਺ʁ ▸ ؔ਺ΛҾ਺ʹͱͬͨΓɺؔ਺Λฦؔ͢਺ ▸ ΍΍͍͜͠ͷͰࠓ͸ৄ͘͠͸આ໌͠·ͤΜ ▸ ܁Γฦ͠ͷͨΊͷ༗໊Ͳ͜ΖͰ͸ map, ΍ forEach ͳͲ͕͋ Γ·͢ ▸ for-inΛ࢖͏ํ๏ΑΓ؆ܿʹॻ͘͜ͱ͕Ͱ͖·͢
26. ςΩετ ͨͱ͑͹ʁ ▸ ஋ஈͷϦετʹରͯ͠ফඅ੫Λ͔͚ͨޙͷ஋ஈͷϦετΛੜ ੒͢ΔྫΛߟ͑·͢ ▸ ͜ΕΛfor-inͰॻ͘ͱ࣍ͷΑ͏ʹͳΓ·͢
27. ςΩετ ϥϯμϜʹੜ੒ͨ͠਺஋ͷഒ਺ΛٻΊΔ // ফඅ੫཰
 let taxRate = 0.08 // ஋ஈͷϦετ let prices: [Double] = [10000, 9800, 34570, 29800, 114514] // ·ͣ͸ۭͷ഑ྻΛੜ੒ var newPrices = [Double]()
28. ςΩετ ϥϯμϜʹੜ੒ͨ͠਺஋ͷഒ਺ΛٻΊΔ // ফඅ੫཰
 let taxRate = 0.08 // ஋ஈͷϦετ let prices: [Double] = [10000, 9800, 34570, 29800, 114514] // ·ͣ͸ۭͷ഑ྻΛੜ੒ var newPrices = [Double]()
 // for-inͰҰ౓഑ྻ͔ΒऔΓग़ͯ͠ɾɾɾ for price in prices { }
29. ςΩετ ϥϯμϜʹੜ੒ͨ͠਺஋ͷഒ਺ΛٻΊΔ // ফඅ੫཰
 let taxRate = 0.08 // ஋ஈͷϦετ let prices: [Double] = [10000, 9800, 34570, 29800, 114514] // ·ͣ͸ۭͷ഑ྻΛੜ੒ var newPrices = [Double]()
 // for-inͰҰ౓഑ྻ͔ΒऔΓग़ͯ͠ɾɾɾ for price in prices { let newPrice = price * taxRate newPrices.append(newPrice) // ·ͨ഑ྻ΁ೖΕΔʂ }
30. ߇͑Ίʹݴͬͯ ໘౗
31. ςΩετ ߴ֊ؔ਺Λ࢖ͬͨ৔߹ ▸ ߴ֊ؔ਺(ࠓճ͸map)Λ࢖͏ͱ࣍ͷΑ͏ʹॻ͘͜ͱ͕Ͱ͖· ͢ // ফඅ੫཰
 let taxRate = 0.08 // ஋ஈͷϦετ let prices: [Double] = [10000, 9800, 34570, 29800, 114514]
32. ςΩετ ߴ֊ؔ਺Λ࢖ͬͨ৔߹ ▸ ߴ֊ؔ਺(ࠓճ͸map)Λ࢖͏ͱ࣍ͷΑ͏ʹॻ͘͜ͱ͕Ͱ͖· ͢ // ফඅ੫཰
 let taxRate = 0.08 // ஋ஈͷϦετ let prices: [Double] = [10000, 9800, 34570, 29800, 114514] let newPrices = prices.map { $0 * taxRate } // ׬੒ʂ
34. ୹͍ʂ
35. ςΩετ ୹͍ʂ ▸ ߴ֊ؔ਺Λ࢖͏ͱͱͯ΋؆ܿʹ͔͚·͢ ▸ ࠓճ࢖ͬͨmapͱ͍͏ߴ֊ؔ਺͸഑ྻͷத਎ʹॱ൪ʹड͚ औͬͨॲཧΛద༻͠ɺ৽͍͠഑ྻΛੜ੒͢Δؔ਺Ͱ͢ ▸ { $0 * taxRate } ͷ෦෼͕഑ྻͷத਎શͯʹద༻͞Εɺͦͷ݁ Ռ͕৽͍͠഑ྻͱͳΓ·͢ ▸ ߴ֊ؔ਺Λ࢖͏͜ͱͰ༨ܭͳίʔυΛল͖ɺͲΜͳॲཧΛ ͍ͨ͠ͷ͔ʁͱ͍͏෦෼ʹूதͰ͖·͢
36. ͪΐͬͱ଴ͬ ͯʂ (TWITTERฒײ)
37. ͦ΋ͦ΋ؔ਺ͬͯ ͳΜ͚ͩͬʁ