Flutter - stateless vs stateful

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Hot reload: 自動更新。(儲存後自動reload)

☝stateless widgets :the state of the widget cannot change over time.  快速鍵stless 

☝stateful widgets: the state of the widget can change over time. If a widget can change—when a user interacts with it. 與使用者互動時，部件能有所變化。 反之，則使用stateless即使。

☝Row()


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