How React Preserve and Reset State

State is isolated between components. React keeps track of which state belongs to which component based on their place in the UI tree. You can control when to preserve state and when to reset it between re-renders.

The UI tree

Browsers use many tree structures to model UI. The DOM represents HTML elements, the CSSOM does the same for CSS. There’s even an Accessibility tree!

React also uses tree structures to manage and model the UI you make. React makes …

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