Is it possible to update the state object and access the updated state object in a same function

React
1 
state = {
    a: 1,
    b: 2,
  };

  updateState = () => {
    const { a, b } = this.state;

    console.log("previous a", a);
    console.log("previous b", b);

    this.setState({ a: b, b: 3 });

    console.log("New a", a); <-- getting previous value here
    console.log("New b", b); <-- getting previous value here

  };

is it possible to get a new value in the same function?
2

No. But setState has a second parameter where you can supply a function that gets called after the state has been updated (and the component has been re-rendered). However usually it’s better to use componentDidUpdate() instead.

3

can you show me how componentDidUpdate() applies here?

4 
componentDidUpdate(prevProps, prevState) {
   if (this.state.b != prevState.b) {
      console.log("previous b", prevState.b);
      console.log("new b", this.state.b);
   }
}