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.

Utilisez l'initialisation d'état paresseux avec le formulaire de fonction useState. Appliquez-le lors du calcul de valeurs initiales coûteuses, telles que la création d'index de recherche, l'analyse de JSON ou des calculs complexes. Source : theorcdev/8bitcn-ui.

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