Pipe Functor

pipefunctor.js

const Container = function(val) {
  this.value = val;
}

Container.of = function(value) {
  return new Container(value);
}

Container.prototype.map = function(fn) {
  Container.of(fn(this.value));
}

const double = x => x * 2;
const minus1 = x => x - 1;

console.log(Container.of([0, 1, 2, 3, 4, 5])
  .map(double)
  .map(minus1))