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

You can use the lastDayOfISOWeek function from the date-fns library in JavaScript to get the last day of the ISO week (which starts on Monday).

Here's an example code snippet that shows how to use the function:

index.tsx
const { lastDayOfISOWeek } = require('date-fns');

const date = new Date('2021-09-28'); // Tuesday
const lastDayOfWeek = lastDayOfISOWeek(date);

console.log(lastDayOfWeek); // Output: 2021-10-03T00:00:00.000Z
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In the example above, the lastDayOfISOWeek function is imported from the date-fns library. Then, a Date object is created for a Tuesday in September 2021.

The lastDayOfISOWeek function is then called with the date object, which returns the Date object for the last day of the ISO week (Sunday).

Finally, the result is logged to the console.

Note that the lastDayOfISOWeek function returns a Date object, so you can use the usual Date methods to format or manipulate the result as needed.