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
TypeScriptの型定義が JavaScriptのバグを駆逐する
Search
Tetsuya Negishi
February 22, 2019
Programming
3
930
TypeScriptの型定義が JavaScriptのバグを駆逐する
Tetsuya Negishi
February 22, 2019
Tweet
Share
More Decks by Tetsuya Negishi
See All by Tetsuya Negishi
SOLIDから考える良いコンポーネントの設計原則
tetsuyanegishi
1
1.5k
React Hooksで美しいコードを書く / Writing beautiful code using React Hooks
tetsuyanegishi
0
190
React初学者が知らない コンポーネント分割テクニック
tetsuyanegishi
1
500
AWS Amplifyで作るサーバーレスバックエンド
tetsuyanegishi
3
1.9k
リアルタイムデータベース Cloud Firestore入門
tetsuyanegishi
10
8.7k
ブロックチェーンのマイニングとはなにか
tetsuyanegishi
1
96
スクラム開発の手法と実例
tetsuyanegishi
0
240
Other Decks in Programming
See All in Programming
The state patternの実践 個人開発で培ったpractice集
miyanokomiya
0
160
複雑なドメインに挑む.pdf
yukisakai1225
5
960
Jakarta EE Core Profile and Helidon - Speed, Simplicity, and AI Integration
ivargrimstad
0
320
print("Hello, World")
eddie
1
450
Flutter with Dart MCP: All You Need - 박제창 2025 I/O Extended Busan
itsmedreamwalker
0
120
AI時代のUIはどこへ行く?
yusukebe
12
7.4k
AIでLINEスタンプを作ってみた
eycjur
1
220
Microsoft Orleans, Daprのアクターモデルを使い効率的に開発、デプロイを行うためのSekibanの試行錯誤 / Sekiban: Exploring Efficient Development and Deployment with Microsoft Orleans and Dapr Actor Models
tomohisa
0
230
パッケージ設計の黒魔術/Kyoto.go#63
lufia
3
410
More Approvers for Greater OSS and Japan Community
tkikuc
1
110
Trem on Rails - Prompt Engineering com Ruby
elainenaomi
1
100
go test -json そして testing.T.Attr / Kyoto.go #63
utgwkk
2
240
Featured
See All Featured
Faster Mobile Websites
deanohume
309
31k
Git: the NoSQL Database
bkeepers
PRO
431
66k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
23
1.4k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
How to train your dragon (web standard)
notwaldorf
96
6.2k
GraphQLの誤解/rethinking-graphql
sonatard
71
11k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Raft: Consensus for Rubyists
vanstee
140
7.1k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
48
9.7k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
30
9.6k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1.1k
Transcript
TypeScriptͷܕఆ͕ٛ JavaScriptͷόάΛۦஞ͢Δ ࠜ؛ప
ࣗݾհ • ࠜ؛ప • ϥϯαʔζגࣜձࣾ • ৽نࣄۀ • ओʹϑϩϯτ·ΘΓ୲ •
ڵຯؔ৺ • React, Vue.js, TypeScript • αʔόʔϨε
ࠓ͢͜ͱ • ৽ϓϩμΫτʹTypeScriptΛಋೖͯ͠ΈͯͲ͏͔ͩͬͨ • TypeScriptͪΌΜͱܕఆٛ͢Ε࠷ߴ • ͋Γ͕ͱ͏TypeScript
ϥϯαʔζͷϑϩϯτΤϯυٕज़ͷมભ 2008 ~ ݱࡏ 2015 ~ ݱࡏ 2018 ~ ݱࡏ
2017 ~ 2018
ϥϯαʔζͷϑϩϯτΤϯυٕज़ͷมભ 2008 ~ ݱࡏ 2015 ~ ݱࡏ 2018 ~ ݱࡏ
2016 ~ 2018
TypeScriptΛͬͯΘ͔ͬͨ͜ͱ ܕఆٛʹΑͬͯόά͕ܹݮ ͪΌΜͱܕఆٛ͠ͳ͍ͱόάΔ
None
JavaScriptͰΑ͘ى͖Δόά
JavaScriptͰΑ͘ى͖Δόά data ʹ number ͷྻΛೖΕΔ → Ұ࣌తʹundefind͕ೖΔύλʔϯ͕͋ͬͨ → <Graph>undefindΛఆ͓ͯ͠ΒͣΤϥʔ ReactͰΓ͕ͪ
Τϥʔ
JavaScriptͰΑ͘ى͖Δόά data ʹ Object ΛೖΕΔ → Ұ࣌తʹundefind͕ೖΔύλʔϯ͕͋ͬͨ → <Graph>undefindΛఆ͓ͯ͠ΒͣΤϥʔ ReactͰͷΤϥʔ΄΅͜ͷύλʔϯͷؾ͕͢Δ
Τϥʔ TypeScriptͰൃੜ͠ͳ͍
TypeScriptͰܕఆٛͨ͠߹
TypeScriptͰܕఆٛͨ͠߹ ? → undefinedΛڐ͢
TypeScriptͰܕఆٛͨ͠߹ propsͷܕ͕ܾ·Δ
TypeScriptͰܕఆٛͨ͠߹ data number[] ͱఆٛ͞Ε͍ͯͨͱ͢Δ
TypeScriptͰܕఆٛͨ͠߹ ͜ͷ࣌Ͱ·ͩΤϥʔ → <Graph>ʹ͢ data ͕ undefinedͰ͋ΔՄೳੑ͕͋Δ
TypeScriptͰܕఆٛͨ͠߹ undefinedͷνΣοΫ Τϥʔ͕ग़ͳ͘ͳΔ
TypeScriptͰܕఆٛͨ͠߹ undefinedͷνΣοΫ Τϥʔ͕ग़ͳ͘ͳΔ
TypeScriptͰܕఆٛͨ͠߹ undefinedͷνΣοΫ Τϥʔ͕ग़ͳ͘ͳΔ όάΛະવʹ͛ͯ࠷ߴ
• ͨͩ͜͠Εܕఆ͕͖ٛͪΜͱ͞Ε͍ͯΔ߹ • ϥΠϒϥϦͰରԠ͍ͯ͠ͳ͍߹ͨ·ʹ͋Δ → any Ͱܕఆٛͯ͠ΓΔ͔͠ͳ͍ → ٯʹόάͷԹচʹͳΓ͍͢ Graph͕ܕఆٛ͞Ε͍ͯͳ͍ͱΤϥʔ͕ग़ͳ͍
Enjoy TypeScript!