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
いまさら振り返るPromise
Search
chikoski
July 23, 2017
Technology
1
570
いまさら振り返るPromise
chikoski
July 23, 2017
Tweet
Share
More Decks by chikoski
See All by chikoski
20210825_ossx
chikoski
0
310
festudy02-wasm
chikoski
1
990
An overview of WebAssembly; how it is used, created, and applied?
chikoski
1
730
Functions in JavaScript
chikoski
1
1.2k
20171018-WASM
chikoski
2
1.4k
20171002-wejs
chikoski
1
590
20170924-html5conference-wasm
chikoski
5
10k
Equivalence_in_JS
chikoski
0
1.5k
Design and Implementation of Tech Talks
chikoski
0
120
Other Decks in Technology
See All in Technology
Modern_Data_Stack最新動向クイズ_買収_AI_激動の2025年_.pdf
sagara
0
210
AIAgentの限界を超え、 現場を動かすWorkflowAgentの設計と実践
miyatakoji
0
140
E2Eテスト設計_自動化のリアル___Playwrightでの実践とMCPの試み__AIによるテスト観点作成_.pdf
findy_eventslides
1
330
Large Vision Language Modelを用いた 文書画像データ化作業自動化の検証、運用 / shibuya_AI
sansan_randd
0
110
リーダーになったら未来を語れるようになろう/Speak the Future
sanogemaru
0
280
多様な事業ドメインのクリエイターへ 価値を届けるための営みについて
massyuu
1
250
[2025-09-30] Databricks Genie を利用した分析基盤とデータモデリングの IVRy の現在地
wxyzzz
0
480
Function calling機能をPLaMo2に実装するには / PFN LLMセミナー
pfn
PRO
0
930
フルカイテン株式会社 エンジニア向け採用資料
fullkaiten
0
9k
Green Tea Garbage Collector の今
zchee
PRO
2
390
生成AIを活用したZennの取り組み事例
ryosukeigarashi
0
200
業務自動化プラットフォーム Google Agentspace に入門してみる #devio2025
maroon1st
0
190
Featured
See All Featured
Java REST API Framework Comparison - PWX 2021
mraible
33
8.8k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
Mobile First: as difficult as doing things right
swwweet
224
10k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
35
3.2k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
285
14k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3.1k
The Invisible Side of Design
smashingmag
301
51k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
188
55k
What's in a price? How to price your products and services
michaelherold
246
12k
Code Review Best Practice
trishagee
72
19k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
KATA
mclloyd
32
15k
Transcript
いまさら振り返るPromise N.Shimizu (
[email protected]
)
Promise: いずれされる処理を表すオブジェクト https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise 1SPNJTF UIFO GVM'JMMFE UIFO SFKFDUFE DBUDI
SFKFDUFE 1SPNJTF Pending Fulfill Reject Return Return
Promise chain GFUDI IUUQTFYBNQMFDPNFOEQPJOUTPNFBDUJPO UIFO SFTQPOTFSFTQPOTFKTPO FSSOPUJGZ&SSPS FSS
UIFO EBUBEBUBMFOHUI EBUB1SPNJTFSFKFDU OPEBUB UIFO EBUBSFOEFS%BUB EBUB FSSOPUJGZ/P%BUB
処理を始めるところと、結果を利用するところを分けられる EP4PNFUIJOH QBSBN SFTQPOTF\ JG SFTQPOTFFSS \ SFUVSOIBOEMF&SSPS SFTQPOTFFSS
^ EP" EP# EP$ EP% DPOTVNF SFTQPOTFSFTVMU ^ DPOTUQEP4PNFUJOH QBSBN EP" EP# EP$ EP% QUIFO DPOTVNF DBUDI IBOEMF&SSPS
Promise: 条件分岐の一種 https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise 1SPNJTF UIFO GVM'JMMFE UIFO SFKFDUFE DBUDI
SFKFDUFE 1SPNJTF Pending Fulfill Reject Return Return
直列化 UFTU" UIFO UFTU# UIFO TVDDFTT DBUDI GBJM
<UFTU" UFTU#> SFEVDF QSP GVOD QSPUIFO GVOD UIFO TVDDFTT DBUDI GBJM 1SPNJTFBMM <UFTU" UFTU# > UIFO TVDDFTT DBUDI GBJM 㛈ᏁҶ⼊ҿӶӔҮ UFTU" UFTU# TVDDFTT GBJM F T T F
並列化 UFTU" DBUDI UFTU# UIFO TVDDFTT DBUDI GBJM
1SPNJTFSBDF <UFTU" UFTU# > UIFO TVDDFTT DBUDI GBJM 㛈ᏁҶ⼊ҿӶӔҮ UFTU" UFTU# TVDDFTT GBJM F T T F
エラー処理を本筋と分けて実装できる MFUSFTVMUEP4PNFUIJOH JG SFTVMUOVMM \ SFTVMUEFGBVMU7BMVF ^ DPOTVNF
SFTVMU EP4PNFUIJOH DBUDI FSSEFGBVMU7BMVF UIFO DPOTVNF
Promise非対応のPromise対応にするには GVODUJPOBEE B C \ SFUVSOB C ^ GVODUJPOQSPNJTFE"EE B
C \ SFUVSO1SPNJTFSFTPMWF B C ^ QSPNJTFE"EE UIFO JDPOTPMFMPH
Promise非対応のPromise対応にするには GVODUJPOBEE B C \ JG B]]C \ UISPXOFX&SSPS *OWBMJEQBSBNFUFS
^ SFUVSOB C ^ GVODUJPOQSPNJTFE"EE B C \ USZ\SFUVSO1SPNJTFSFTPMWF BEE B C ^ DBUDIFSS\SFUVSO1SPNJTFSFKFDU FSS ^ ^
Promise非対応のPromise対応にするには DPOTUGTSFRVJSF GT GVODUJPOSFBE GJMF \ SFUVSOOFX1SPNJTF SFTPMWF SFKFDU
\ GTSFBE'JMF GJMF FSS EBUB \ FSS SFTPMWF FSS SFKFDU EBUB ^ ^ ^
Promise非対応のPromise対応にするには GVODUJPOBEE0OF OVNCFST \ DPOTUSFTVMU<> GPS DPOTUOVNPGOVNCFST \ SFTVMUQVTI OVN
^ ^ GVODUJPOQSPNJTFE"EE0OF OVNCFST \ SFUVSO1SPNJTFBMM OVNCFSTNBQ J1SPNJTFSFTPMWF J ^
Anti-pattern: ネストしたPromise EP" UIFO SFTVMU"\ EP# UIFO SFTVMU#DPOTVNF SFTVMU" SFTTVMU#
^ 1SPNJTFBMM <EP" EP# > UIFO SFTVMUTDPOTVNF SFTVMUT<> SFTVMU<> http://taoofcode.net/promise-anti-patterns/
Anti-pattern: 続かないチェーン GVODUJPOEP4PNFUIJOH \ DPOTUQSPNJTFEP" QSPNJTFUIFO SFTVMUDPOTVNF SFTVMU
SFUVSOQSPNJTF ^ GVODUJPOEP4PNFUIJOH \ SFUVSOEP" UIFO SFTVMUDPOTVNF SFTVMU ^ http://taoofcode.net/promise-anti-patterns/