useState

useState<T>(key: string, init?: () => T | Ref<T>): Ref<T>

• key: A unique key ensuring that data fetching is properly de-duplicated across requests
• init: A function that provides initial value for the state when not initiated. This function can also return a Ref.
• T: (typescript only) Specify the type of state

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Read more in Guide > Features > State Management.