Use Set State - Mantine

import { Layout } from '@/layout'; import { MDX_DATA } from '@/mdx';

export default Layout(MDX_DATA.useSetState);

Usage

The use-set-state hook works similarly to how this.setState works in class components – it shallow merges the state partial into the current state.

tsx

import { useSetState } from '@mantine/hooks';

const [state, setState] = useSetState({
  name: 'John',
  age: 35,
  job: 'Engineer',
});

state; // -> { name: 'John', age: 35, job: 'Engineer' }

setState({ name: 'Jane' }); // -> { name: 'Jane', age: 35, job: 'Engineer' }
setState({ age: 25, job: 'Manager' }); // -> { name: 'Jane', age: 25, job: 'Manager' }
setState((current) => ({ age: current.age + 7 })); // -> { name: 'Jane', age: 32, job: 'Manager' }

Note that it can work only with objects; primitive values and arrays are not supported:

tsx

import { useSetState } from '@mantine/hooks';

useSetState([1, 2, 3]); // -> will not work
useSetState(1); // -> will not work
useSetState({ skills: ['JavaScript', 'TypeScript'] }); // -> works fine

Definition

tsx

type UseSetStateCallback<T> = (
  state: Partial<T> | ((currentState: T) => Partial<T>)
) => void;

type UseSetStateReturnValue<T> = [T, UseSetStateCallback<T>];

function useSetState<T extends Record<string, any>>(initialState: T): UseSetStateReturnValue<T>

Exported types

UseSetStateCallback and UseSetStateReturnValue types are exported from the @mantine/hooks package; you can import them in your application:

tsx

import type { UseSetStateCallback, UseSetStateReturnValue } from '@mantine/hooks';