how to use the tolocalestring function from the rxjs library in javascript

The toLocaleString function is a part of the RxJS library which is used for internationalization and localization purposes. It provides options for formatting numbers, currencies, and dates into a string format that can be understood by users from different locales.

Here is an example of how to use the toLocaleString function in RxJS:

index.tsx
import { of } from 'rxjs';
import { map } from 'rxjs/operators';

const number = of(123456.789);

// format as currency
const currency = number.pipe(map(x => x.toLocaleString('en-US', { style: 'currency', currency: 'USD' })));
currency.subscribe(x => console.log(x)); // output: $123,456.79

// format as date
const date = new Date();
const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
const formattedDate = date.toLocaleString('en-US', options);
console.log(formattedDate); // output: Wednesday, September 22, 2021
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In this example, we use the of method to create an observable that emits the number 123456.789. We then use the map operator to transform the emitted value into a currency or date format using the toLocaleString function.

To format a number as currency, we pass the locale (in this case, en-US) and an options object containing the style property set to 'currency' and the currency property set to 'USD'.

To format a date, we create a new Date object and pass it to the toLocaleString function along with the locale and an options object containing the desired date format.

Overall, using the toLocaleString function from the RxJS library is a powerful and flexible way to format data for users from different locales.