What are the possible ways of updating objects in state?

1. Calling setState() with an object to merge with state:

• Using Object.assign() to create a copy of the object:

const user = Object.assign({}, this.state.user, { age: 42 });
this.setState({ user });

• Using spread operator:

const user = { ...this.state.user, age: 42 };
this.setState({ user });

2. Calling setState() with a function:

this.setState((prevState) => ({
user: {
...prevState.user,
age: 42,
},
}));