Lazy Streams in Node

tco.js

"use strict";

// http://stackoverflow.com/questions/23260390/node-js-tail-call-optimization-possible-or-not
// Tested and working with node v7.2.0. Both of the following work:
// node --harmony_tailcalls tco.js
// node --harmony tco.js

const natsFrom = (n) => [n, () => natsFrom(n+1)]
const kth = ([hd, tl], k) => k === 0 ? hd : kth(tl(), k - 1)

console.log(
  kth(natsFrom(1337), 8000000)
)