A simple ES6 bind function to implement Railway oriented programming. https://vimeo.com/113707214

bind.js

const compose = (...fns) => (...args) => {
  return fns.slice(0, -1).reduceRight((res, fn) => fn(res), 
    fns[fns.length -1].apply(null,args)
  );
};

const bind = (f) => (...args) => {
  if(args[0] instanceof Error) return args[0];
  try{
    return f.apply(null, args);
  }catch(e){
    if(e instanceof Error) return e;
    return new Error(e);
  }
};

class Error{
  constructor(err){
    this.error = err;
  }
}



// stupid example

const isDivisible = (d) => (n) => {
  if(n % d) throw `${n} is not divisible by ${d}`;
  return n;
}
const isDivisibleBy3 = isDivisible(3);
const isDivisibleBy4 = isDivisible(4);
const isDivisibleBy6 = isDivisible(6);

const isDivisibleBy3And4And6 = compose(
  bind((n) => `${n} is divisible by 3, 4 and 6`),
  bind(isDivisibleBy6),
  bind(isDivisibleBy4),
  bind(isDivisibleBy3)
)

isDivisibleBy3And4And6(4);  // { error: "4 is not divisible by 6" }
isDivisibleBy3And4And6(6);  // { error: "6 is not divisible by 4" } 
isDivisibleBy3And4And6(12); // "12 is divisible by 3, 4 and 6"