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#Session 3 選擇 Svelte 的三個理由

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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簡報連結

也可以參考 ModernWeb'21 的簡報

講者介紹

Kalan 愷開

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What's Svelte

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  • 一門前端框架 (50K+
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    )
  • Rich Harris
  • 事先編譯
    • 減少 Runtime 體積
  • 400+ contributors
    • You're welcome :)

Agenda

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Too many frameworks!

  • 框架的出現代表開發者對現況的不滿
  • 人們對於最佳實踐的探索
    • 早期的 jQuery
      • HTML / CSS / JS 分開寫
    • React -> JSX
      • 元件化
      • CSS in JS
        • 更靈活

簡介 Svelte

現代前端框架的基本要素

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  • 每一個檔案都是單獨元件
  • Vue 3 的 ref()
    • 修改變數 -> 觸發更新
    • 不需要手動呼叫 DOM 的 API
  • 減少開發者的認知負擔

問題點

  • 需要在 runtime 做 diff 演算
    • 增加 bundle size
  • 需要時做一套響應機制
    • 犧牲一部分效能

選擇 Svelte 的三個理由

語法容易、容易上手

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  • 一個 HTML 程式碼
  • Svelte 特殊處理
  • 對變數的計算就有響應效果

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twitter.com/AdamRackis/status/1438221959029039108

響應式語法

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  • 開發者不需要手動加入變數依賴

樣板語法

  • For 迴圈
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    • 不是回傳 HTML Code 回來
  • 線上 REPL 與互動式教學
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    • Image Not Showing Possible Reasons
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Bundle size 體積小

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  • 涉及畫面更新會 Compile 出 invalidate

Showcase

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關於 Bundle size

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關注度持續提升

開發者與社群的反應可當作指標參考

  • 越受關注，越令人好奇

State of JS 2020

  • 滿意度第一名
  • 使用情形：第四名
    • (8% -> 15% 變化不大)
    • 有慢慢在成長

SO Survey 2021

最受喜愛的框架？

有用 Svelte 的公司

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Image Not Showing Possible Reasons
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缺點

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  • 大部分的處理都在編譯時期
  • 相對其他框架資源較少
  • 使用率仍然偏低
    • 其實也不低了

final

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