useMergeState

API

import useMergeState from '@restart/hooks/useMergeState'

useMergeState<TState>(initialState: TState | () => TState) => [TState,MergeStateSetter<TState>]
Mimics a React class component's state model, of having a single unified state object and an updater that merges updates into the existing state, as opposed to replacing it.
```
const [state, setState] = useMergeState({ name: 'Betsy', age: 24 })
setState({ name: 'Johan' }) // { name: 'Johan', age: 24 }
setState(state => ({ age: state.age + 10 })) // { name: 'Johan', age: 34 }
```
Parameters
- initialStateTState | () => TState
  The initial state object
Return Value [TState,MergeStateSetter<TState>]