rerender-lazy-state

SKILL.md

Pass a function to useState for expensive initial values. Without the function form, the initializer runs on every render even though the value is only used once.

Use lazy initialization when computing initial values from localStorage/sessionStorage, building data structures (indexes, maps), reading from the DOM, or performing heavy transformations.

For simple primitives (useState(0)), direct references (useState(props.value)), or cheap literals (useState({})), the function form is unnecessary.

通過 useState 函數形式使用惰性狀態初始化。在計算昂貴的初始值（例如構建搜索索引、解析 JSON 或複雜計算）時應用。 來源：theorcdev/8bitcn-ui。

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