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

To use the startOfDecade() function from date-fns library in JavaScript, you first need to install it using npm:

index.tsx
npm install date-fns --save
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Then, you can import the startOfDecade() function in your JS file and use it like this:

const dateFns = require('date-fns');

// get the start of the decade for the provided date
const date = new Date('2019-11-20');
const startOfDecade = dateFns.startOfDecade(date);

console.log(startOfDecade); // 2010-01-01T00:00:00.000Z
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In the above example, we have first imported the date-fns library and then used the startOfDecade() function to get the start of the decade for the provided date. The startOfDecade() function takes a Date object as an argument and returns a Date object representing the start of the decade.