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#Session 1 在你的庭院種一棵Elm

歡迎來到 JSDC 2021 共筆

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共筆入口：https://hackmd.io/@JSDC-tw/2021conference
手機版請點選上方 按鈕展開議程列表。

共筆協作，共享知識，打造開放社群。

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Welcome to JSDC 2021 Collaborative Writing

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Collaborative Writing Workplace：https://hackmd.io/@JSDC-tw/2021conference
Using mobile please tap to unfold the agenda.

Build a community with open collaboration.

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從這開始
可以直接打字做共筆囉

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Paipo

Elm

範例外送服務網站
API 資料架構

Loading 狀態

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Error

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Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
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Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
  • The image format is not supported
Learn More →

Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
  • The image format is not supported
Learn More →

Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
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總結狀態

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TypeScript 的不保證

TypeScript 不能保證 Type
需要啟用 Advanced Types 技巧
ex. Union Types

不可能的狀態為何會發生?

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TS 的 | 比較像「有這幾種可能」
& 是真的 AND

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API 不尊重合約呢？

相信前端的 Declaration 但後端不見得會 Follow

總結遇到的問題

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Elm

更好的 Type

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  • 簡潔
  • Custom Type 不是進階，很簡單

分離安全與不安全

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  • 定義好後，Compile 遇錯會出錯
  • Decoder 強迫你履行合約

更精確描述 Types

fetch API 為什麼不能寫滿 Type

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Elm 會提醒你沒有處理到的可能

More …

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Concludes

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  • Java 即使 Strong Type 還是有 Runtime Error
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