Railway Oriented Programming (JavaScript)

railway_oriented_programming.js

var _ = require('lodash');

var Success = function(success) { this.success = success; };
var Failure = function(failure) { this.failure = failure; };

var bindAll = function(fs) {
  var bind = function(res, f) {
    return res instanceof Success ? f(res.success) : res;
  };
  var bindF = function(f) { return _.partial(bind, _, f); };
  return _.flow.apply(_, _.map(fs, bindF));
};

var f1 = function(s) { // input => Success | Failure
  return new Success(s + ' f1');
  return new Failure('error f1');
};

var f2 = function(s) {
  return new Success(s + ' f2');
  return new Failure('error f2');
};

var f3 = function(s) {
  return new Success(s + ' f3');
  return new Failure('error f3');
};

console.log(bindAll([ f1, f2, f3 ])(new Success('start')));