useState

Returns a stateful value, and a function to update it.

function useState<S>(initialState: S | (() => S)): [S, StateUpdater<S>];

function useState<S = undefined>(): [S | undefined, StateUpdater<S | undefined>];

useState<S>(initialState: S | (() => S)): [S, StateUpdater<S>]

Returns a stateful value, and a function to update it.

initialState: S | (() => S)

The initial value (or a function that returns the initial value)

useState<S = undefined>(): [S | undefined, StateUpdater<S | undefined>]

S = undefined

[S | undefined, StateUpdater<S | undefined>]