Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
ジェネレータを有効活用し隊 / Kyoto.js 11 LT
Search
Susisu
October 22, 2016
Programming
2
2k
ジェネレータを有効活用し隊 / Kyoto.js 11 LT
Kyoto.js 11
http://kyotojs.connpass.com/event/39462/
Susisu
October 22, 2016
Tweet
Share
More Decks by Susisu
See All by Susisu
Mackerel のフロントエンドフレームワーク移行 序章 / Hatena Engineer Seminar #13
susisu
0
1.9k
スクリーンショット撮影のために Puppeteer を操る / Kyoto.js 16
susisu
0
720
BuckleScript 使ってみた
susisu
0
240
Atom パッケージ開発のすゝめ
susisu
1
2k
5分でわかる Curry–Howard 同型対応
susisu
0
780
遅延評価と健康
susisu
0
560
楽しく学ぶ難解プログラミング言語
susisu
0
650
多分これが一番早いと思います
susisu
0
390
私を SKI に連れてって
susisu
0
270
Other Decks in Programming
See All in Programming
Code Reviews
bkuhlmann
4
890
Prepare for Jakarta EE 11 - Performance and Developer Productivity
ivargrimstad
0
750
dbtのドメイン分割による データ基盤の改善とDigdagとの連携
sakama
0
200
Java 22 Overview
kishida
1
180
Zero Waste, Radical Magic, and Italian Graft – Quarkus Efficiency Secrets
hollycummins
0
230
HUIT新歓2024「競技プログラミング、やってみませんか?」
slephy2784
1
270
コーンフレークから始める モデリング会話入門
ogurotakayuki
0
370
0→1と1→10の狭間で Javaという技術選定を振り返る/Reflecting on the Decision to Choose Java Between Scaling from 0 to 1 and 1 to 10
jaguar_imo
2
380
Netty Chicago Java User Group 2024-04-17
sullis
0
170
Goのmultiple errorsについて (2024年4月版)
syumai
3
660
OpenAPIを中心に考えるAPI開発入門 / Introduction to API Development with a Focus on OpenAPI
seike460
PRO
2
170
Build Apps for iOS, Android & Desktop in 100% Kotlin With Compose Multiplatform (mDevCamp 2024)
zsmb
0
320
Featured
See All Featured
Building Flexible Design Systems
yeseniaperezcruz
319
37k
Unsuck your backbone
ammeep
663
57k
Designing for Performance
lara
601
67k
Facilitating Awesome Meetings
lara
42
5.6k
How to name files
jennybc
65
93k
Building a Modern Day E-commerce SEO Strategy
aleyda
17
6.4k
Principles of Awesome APIs and How to Build Them.
keavy
121
16k
Atom: Resistance is Futile
akmur
259
25k
Code Review Best Practice
trishagee
55
15k
Infographics Made Easy
chrislema
238
18k
Why You Should Never Use an ORM
jnunemaker
PRO
51
8.6k
4 Signs Your Business is Dying
shpigford
175
21k
Transcript
δΣω Ϩ ʔ λ Λ ༗ ޮ ׆ ༻ ͠
ୂ 2 0 1 6 - 1 0 - 2 2 K y o t o . j s 1 1 Twitter @susisu2413 / GitHub @susisu
Q . δΣω Ϩ ʔ λ Կ ʹ
͑Δʁ
1 . ί ϧ ʔ νϯ
app.use(function* (next) { const start = new Date(); // (1)
yield next; const end = new Date(); // (3) // log (4) }); ! app.use(function* (next) { yield next; // respond (2) }); ྫ: Koa
2 . Ԇ Ϧε τ
function range(a, b, s = 1) { const arr =
[]; for (let n = a; n < b; n += s) { arr.push(n); } return arr; } ! for (const n of range(1, 10)) { doSomething(n); // from 1 to 9 }
function* xrange(a, b, s = 1) { for (let n
= a; n < b; n += s) { yield n; } } ! for (const n of xrange(1, 10)) { doSomething(n); // from 1 to 9 }
function* fibonacci() { let [a, b] = [1, 1]; while
(true) { yield a; [a, b] = [b, a + b]; } } ! for (const n of fibonacci()) { doSomething(n); // 1, 1, 2, 3, 5, ... }
3 . Π ς Ϩ ʔ λ ͷ Ճ
function* concat(iter1, iter2) { yield* iter1; yield* iter2; } !
for (const x of concat(arr1, arr2)) { doSomething(x); }
function* map(func, iter) { for (const x of iter) {
yield func(x); } } ! for (const n of map(n => n ** 2, arr)) { doSomething(n); }
4 . ඇ ಉ ظ ॲ ཧ
fetch().then(x => fetch().then(y => fetch().then(z => doSomething(x, y, z) )
) ); before (Promise)
co(function* () { const x = yield fetch(); const y
= yield fetch(); const z = yield fetch(); return doSomething(x, y, z); }); after (Promise + Generator + co)
Q . ଞ ʹ δΣω Ϩ ʔ λ ͕
͑Δ ໘ ͋ Δʁ
ͦ ͦ δΣω Ϩ ʔ λ ͱ
g e n . n e x t ( )
{ d o n e : f a l s
e , v a l u e : * } g e n . n e x t ( )
{ d o n e : f a l s
e , v a l u e : * } g e n . n e x t ( ) g e n . n e x t ( ) gen.next ͷதมΘ͍ͬͯΔ
{ d o n e : f a l s
e , v a l u e : * } { d o n e : f a l s e , v a l u e : * } g e n . n e x t ( ) g e n . n e x t ( ) g e n . n e x t ( )
{ d o n e : f a l s
e , v a l u e : * } { d o n e : f a l s e , v a l u e : * } { d o n e : t r u e , v a l u e : * } g e n . n e x t ( ) g e n . n e x t ( ) g e n . n e x t ( )
ݟํΛม͑Δͱ͍͔ʹԆϦετ d o n e : f a l s
e v a l u e ( ) = > d o n e : f a l s e v a l u e ( ) = > d o n e : t r u e v a l u e
d o n e : f a l s e
v a l u e x = > d o n e : f a l s e v a l u e y = > d o n e : t r u e v a l u e .next() ҾΛͱΕΔ
fetch().then(x => fetch().then(y => fetch().then(z => doSomething(x, y, z) )
) ); PromiseΛͬͨඇಉظॲཧ
None
d o n e : f a l s e
v a l u e x = > d o n e : f a l s e v a l u e y = > d o n e : t r u e v a l u e
t h e n v a l u e x
= > t h e n v a l u e y = > re s o l v e v a l u e .then() Ͱͭͳ͗߹ΘͤΔ
co(function* () { const x = yield fetch(); const y
= yield fetch(); const z = yield fetch(); return doSomething(x, y, z); }); Promise + Generator + co
Q . ଞ ʹ δΣω Ϩ ʔ λ ͕
͑Δ ໘ ͋ Δʁ
A . ͋ Γ · ͢
5 . ύ ʔ α ί ϯ Ϗω ʔ λ
symbol("(").bind(_ => expr.bind(x => symbol(")").bind(_ => pure(x) ) ) );
ׅހ (ʙ) ʹೖͬͨࣜͷύʔα
qo(function* () { yield symbol("("); const x = yield expr;
yield symbol(")"); return x; }); దͳؔΛ͑……
6 . * ద ͳ Ϟ φ υ ※
Ͳ ΕͰ ྑ ͍ ͱ ͍ ͏ Θ ͚ Ͱ ͳ ͍
δΣω Ϩ ʔ λ Λ ༗ ޮ ׆ ༻ ͠
ୂ ׆ ಈ ใ ࠂ
δΣω Ϩ ʔ λ Ԇ Ϧε τ Λ
Ұ ൠ Խ ͠ ͨ Α ͏ ͳ ͷ
· ͩ · ͩ ͑Δ ໘ ͕ ͋
Γ ͦ ͏ ྫ : ύ ʔ α ί ϯ Ϗω ʔ λ
ଞ ʹ ׆ ༻ ࣄ ྫ ͕ ͋ Ε
͓ ڭ ͑͘ ͩ ͞ ͍
{ d o n e : t r u e
, v a l u e : " T h a n k s " }