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.

通过 useState 函数形式使用惰性状态初始化。在计算昂贵的初始值（例如构建搜索索引、解析 JSON 或复杂计算）时应用。 来源：theorcdev/8bitcn-ui。

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