How to get the value of state after using setState in React

this.setState({ name: "Hello Chris1993!" }, () => {
  console.log(this.state.name); // output: Hello Chris1993!
});

For Functional Component Use useEffect.

useEffect(() => {
  console.log(state) // do something after state has updated 

}, [state]) 

Get difference between 2 dates in JavaScript

const date1 = new Date('10/15/2020');
const date2 = new Date('12/1/2020');

const diffTime = Math.abs(date2 - date1); // time in milliseconds
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24)); // convert time to days

Note: Difference in date always return in milliseconds.

How to remember

- 1000 Milliseconds to 1 Sec
- 60 Sec 1 Minute
- 60 Min 1Hr
- 24 Hr to 1 Day

React : Use Single Handler to update all input textbox

    const handleUpdateInput = (e) => {
        let key = e.target.name;
        setEmpData({
            ...empData,
            [key]:e.target.value
        })

    }