// CommonJS
const Iterable = require('ix/iterable').IterableX;
require('ix/add/iterable-operators/chain');
const of = require('ix/iterable/of').of; 
const filter = require('ix/iterable/filter').filter;
const map = require('ix/iterable/map').map;

const results = of(1,2,3)
  .chain(source => filter(source, x => x % 2 === 0))
  .chain(source => map(source, x => x * x));

for (let item of results) {
  console.log(`Next ${item}`)
}