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ecmascript-proposal-first-class-protocol
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Taketoshi Aono(青野健利 a.k.a brn)
October 06, 2017
Programming
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ecmascript-proposal-first-class-protocol
EcmascriptのFirst class protocolの提案について
Taketoshi Aono(青野健利 a.k.a brn)
October 06, 2017
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Transcript
proposal-first-class-protocol
せ: @brn (ꫬꅿ⨳ⵃa.k.a ـٕ٦ظ) 耵噟: ؿٗٝزؒٝسؒٝآص،٥iOSؒٝآص، ⠓爡: Cyberagent ،سذؙأةآؔRightSegment٥AI Messenger
ـؚٗ: http://abcdef.gets.b6n.ch/ Twitter: https://twitter.com/brn227 GitHub: https://github.com/brn
What is this proposal ? protocolך䲿周 ⯋ղכinterfaceך䲿周կ
What is 'protocol' ? classָ㹋鄲ׅץֹ鋉秈邌ׅկ 㹋䡾כקהוinterfaceהずׄדծ swiftװobjective-cדכinterfaceprotocolהㄎןծ javaדכず瘝ךךinterfaceהㄎע(稢ְַ鎉铂➬圫♳ך麩ְכ֮ ָ)
Ecmascript way ׃ַ׃Ecmascriptךprotocolכֿך⚕倯ה殯ז杝荈ך➬圫ָ䲿 周ׁגְկ
As Symbol 植㖈䲿周⚥ךֿךproposalכprotocolծ ًاحس䭯אSymbolך꧊さה׃ג邌ׅկ
protocol ProtocolName {! // 実装が必要なシンボルを宣言 thisMustBeImplemented;! ! // メソッド実装 youGetThisMethodForFree()
{! return this[ProtocolName.thisMustBeImplemented]();! }! }! ! class ClassName implements ProtocolName {! [ProtocolName.thisMustBeImplemented]() {! ...! }! } !
Extends Existing class 傀㶷ךclassח㼎׃גprotocol㹋鄲ֿׅהָדֹկ
protocol Functor {! map;! }! ! Promise.prototype[Functor.map] = () =>
{! ...! }! ! Protocol.implement(Promise, Functor);!
'implements' keyword 倜חimplements怴皾㶨ָ鷄⸇ׁ
Promise implements Functor // true! ! if (MyClass implements SomeProtocol)
{ }!
Extends protocol protocolכ➭ךprotocol䭁䓸דֹ
protocol A { a; }! protocol B extends A {
b; }! ! class C implements B {! [A.a]() {}! [B.b]() {}! }! ! class D implements A {! [A.a]() {}! }!
Default Implementation ⴱ劍㹋鄲鷄⸇דֹ
protocol A { a; }! ! protocol B extends A
{! [A.a]() { ... }! }!
Static protocol 涸ًاحسprotocolדⵖ䖴ֿׅהָ〳腉
protocol A {! static b() {}! }! ! class C
implements A { }! C[A.b]();!
Issues 傀㶷ךؙٓأ䭁䓸ׅ㜥さծprototypeפך湫䱸➿Ⰵהְֲ䲿周ָ 遤גְկ ְֻזד儗➿鹼זךדծ➿剏周䲿周׃גְֶկ
Proposed 1 Protocol.impelemtꟼ侧ך痥♲䒷侧ד㹋鄲
protocol Functor {! map;! }! ! // If implementation is
not satisfied, throw TypeError.! Protocol.implement(Array, Functor, {! [Functor.map]: Array.prototype.map! });!
Proposed 2 傀㶷ךؙٓأⱄ䏝implementsؗ٦ٙ٦سד䭁䓸〳腉ח
protocol Functor {! map;! }! ! // We can implements
protocol after declaration.! Array implements Functor {! [Functor.map]: Array.prototype.map! }!
TypeScript? הִ֮׆ծ傀㶷ךinterfaceכ婍ׅדֲ֮הךֿהկ protocolוך״ֲז㘗ה׃ג䪔ֲַכ劢㹀 Allow dynamic name in typesהְֲ㘗ךفٗػذ؍せחsymbol ⢪ֲֿהָדֹPRָ鹌דְךדծ ָֿ㹋鄲ׁהprotocolأي٦ؤחְַֽկ
׀幠耮ָ֮הֲ׀ְׂת׃