how to use the startofisoweek function from date-fns in javascript

The startOfISOWeek function from the date-fns library is used to get the start of the ISO week of a given date. Here's how you can use it:

1. First, you need to install the date-fns library:

index.tsx
npm install date-fns
21 chars
2 lines

2. Once installed, you can import the startOfISOWeek function in your javascript file like this:

index.tsx
import { startOfISOWeek } from 'date-fns';
43 chars
2 lines

3. You can now use the startOfISOWeek function to get the start of the ISO week of a date. Here's an example:

index.tsx
const date = new Date('2021-08-10T23:10:00');
const startOfWeek = startOfISOWeek(date);
console.log(startOfWeek); // Output: 2021-08-09T00:00:00.000Z
150 chars
4 lines

In the example above, we create a new date object for August 10th, 2021 at 11:10 PM. We then pass this date to the startOfISOWeek function which returns the start of the ISO week for this date (which is August 9th, 2021 at 12:00 AM).