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SwiftのAsync / Awaitについて
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Takaaki Tanaka
April 14, 2018
Technology
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200
SwiftのAsync / Awaitについて
第1回 HAKATA.swift ~福岡でSwiftの勉強会~
Takaaki Tanaka
April 14, 2018
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Transcript
SwiftͷAsync / Await ʹ͍ͭͯ ୈ1ճ HAKATA.swift
"CPVUNF
wΫϥεϝιουגࣜձࣾ wϞόΠϧΞϓϦαʔϏε෦ wJ04ΞϓϦΤϯδχΞ wαʔόʔαΠυΞϓϦΤϯδχΞ wαʔόʔϨε։ൃ෦ wΞϓϦέʔγϣϯΤϯδχΞ ాத໌ @kongmingtrap
wΫϥεϝιουגࣜձࣾ wϞόΠϧΞϓϦαʔϏε෦ wJ04ΞϓϦΤϯδχΞ wαʔόʔαΠυΞϓϦΤϯδχΞ wαʔόʔϨε։ൃ෦ wΞϓϦέʔγϣϯΤϯδχΞ ాத໌ @kongmingtrap
wΫϥεϝιουגࣜձࣾ wϞόΠϧΞϓϦαʔϏε෦ wJ04ΞϓϦΤϯδχΞ wαʔόʔαΠυΞϓϦΤϯδχΞ wαʔόʔϨε։ൃ෦ wΞϓϦέʔγϣϯΤϯδχΞ ాத໌ @kongmingtrap :".-༑ୡʂʂ
Ϟνϕʔγϣϯ
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ձࣾͷۚͰߦ͘ ւ֎ΧϯϑΝϨϯε ࠷ߴͩͥʜ
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IUUQTBXTBNB[PODPNKQBCPVUBXTXIBUTOFXBXTMBNCEB TVQQPSUTOPEFKT
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"TZOD"XBJUGPS4XJGU ΤϥʔϋϯυϦϯ άͰͷίʔϧόο Ϋࠈ
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"TZOD"XBJUGPS4XJGU ͖݅Ͱඇಉظॲཧ Λ࣮ࢪ͍ͨ͠߹ɺେ ͷ߹ɺίʔυʹ ΫϩʔδϟΛॻ͘͜ͱ ʹͳΔ
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"TZOD"XBJUGPS4XJGU ޙͷॲཧͰHVBSEͳͲͰ ฦΔͷߟྀΛΕͯ͠ ·͏ ͦͦσόοά͠ਏ͍
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"TZOD"XBJUGPS4XJGU ʢϥτφʔࢯͷܦݧଇͱલஔ͖ͭͭ͠ʜʣ ඇಉظ"1*Λ࡞ͬͯɺଟ͘ͷ߹6*ͷߋ৽ͳͲ ͕བྷΉͨΊɺಉظಈ࡞Ͱߦ͏͜ͱ͕ଟ͍
"TZOD"XBJUGPS4XJGU
"TZOD"XBJUGPS4XJGU ࠶։ՄೳͳॲཧΛඳ͖͍ͨ࣌ɺ4XJGUͷ߹ͩͱɺ ஈ֊తʹΛੜ͢ΔͷΛͱͯ͠ఆٛ͢Δඞཁ͕ ͋Δ
"TZOD"XBJU
wඇಉظॲཧͷߏจ w1SPNJTFΛ؆ܿʹهड़Ͱ͖ΔΑ͏ʹͨ͠ w༷ʑͳݴޠʹΤοηϯε͕औΓࠐ·Ε͍ͯ Δʢ+BWB4DSJQUɺ$ɺ1ZUIPOɺ3VTUʜʣ "TZOD"XBJU
ଞͷݴޠͷඇಉظॲཧ
wඇಉظॲཧͷ࠷ऴతͳࣦྃ͘͠ഊΛ ද͢ΦϒδΣΫτ w݁ՌΛUIFOϝιουͳͲͰνΣΠϯͤ͞Δ 1SPNJTF
1SPNJTF doSomething().then(function(result) { return doSomethingElse(result); }) .then(function(newResult) { return doThirdThing(newResult);
}) .then(function(finalResult) { console.log('Got the final result: ' + finalResult); }) .catch(failureCallback);
wऴ͍ྃͯ͠Δ͔Ͳ͏͔Θ͔Βͳ͍ॲཧ݁Ռ ΛநԽͨ͠ܕ w'VUVSFະདྷͷ݁ՌΛද͢ܕ wจࣈ௨Γɺ૬खʢॲཧ͢Δଆʣʹʮະདྷʯ Λୗ͢ 'VUVSF
'VUVSF val f: Future[List[String]] = Future { session.getRecentPosts } f
onFailure { case t => println("Τϥʔ͕ൃੜͨ͠: " + t.getMessage) } f onSuccess { case posts => for (post <- posts) println(post) }
wඇಉظͰฦ͞ΕΔΛड͚ΔͨΊͷߏจ "XBJU function resolveAfter2Seconds(x) { return new Promise(resolve => {
setTimeout(() => { resolve(x); }, 2000); }); } async function f1() { var x = await resolveAfter2Seconds(10); console.log(x); // 10 } f1();
wඇಉظͰΛฦ͢͜ͱΛ໌ࣔ͢Δߏจ "TZOD GVODUJPOSFTPMWF"GUFS4FDPOET \ SFUVSOOFX1SPNJTF SFTPMWF\ TFU5JNFPVU \ SFTPMWF SFTPMWFE
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"TZOD function resolveAfter2Seconds(x) { return new Promise(resolve => { setTimeout(()
=> { resolve(x); }, 2000); }); } async function add1(x) { const a = await resolveAfter2Seconds(20); const b = await resolveAfter2Seconds(30); return x + a + b; } add1(10).then(v => { console.log(v); // 4ඵޙʹ60Λදࣔ͠·͢ɻ });
4XJGUͰ ࣮ݱ͠Α͏ͱ͢Δͱ
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"TZOD"XBJUGPS4XJGU #FGPSF
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✌ Т✌ ࡾ✌ Т ✌ࡾ ✌Т ✌
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1SFQBSJOHGPSEJTUSJCVUFETZTUFNGBJMVSFTVTJOHBLLB 4DBMB.BUTVSJ ࢀߟจݙ
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