Single pass array transformations with IxJS (iterables + generators)

foo.js

const add1 = n => n + 1;
const square = n => n * n;

// 
// Array methods
// 

// Each time a method is called, a new array is immediately constructed.

[1, 2, 3, 4]
  .map(add1) // [2,3,4,5]
  .map(square); // [4,9,16,25]

//
// IxJS functions (built with iterables + generators)
//

// Each time a method is called, a new Iterable is returned, but no computation is done.

import * as Ix from "ix";

Ix.Iterable.from([1, 2, 3, 4])
  .map(add1) // Iterable (no computation has been done yet)
  .map(square) // Iterable (no computation has been done yet)
  .toArray(); // [4,9,16,25]

// Related reading: http://raganwald.com/2017/04/19/incremental.html#the-stream-approach