FizzBuzz is RxJS

fizzbuzz.js

#!/usr/bin/env node

const fizz = "Fizz";
const buzz = "Buzz";
const fizzbuzz = `${fizz}${buzz}`;

const Rx = require('rxjs/Rx');

Rx.Observable.range(1,100)
  .map(n => n % 15 === 0 ? fizzbuzz : (n % 3 === 0 ? fizz : (n % 5 === 0 ? buzz : n)))
  .subscribe(console.log);

I really like it !
A new way with rxJs 6 or. above could be

const { range } = rxjs; // i use a cdn, don't care about this
const { map } = rxjs.operators; // i use a cdn, don't care about this

const fizz = "Fizz";
const buzz = "Buzz";
const fizzbuzz = `${fizz}${buzz}`;

range(1, 100).pipe(
    map(n => n % 15 === 0 ? fizzbuzz : (n % 3 === 0 ? fizz : (n % 5 === 0 ? buzz : n)))
).subscribe(console.log);