simple Promise#spread decorator

spread.js

function decorate(Promise) {
  Promise.prototype.spread = function(yep, nope) {
    var args = [yep ? resolver(yep) : null];
    
    if (nope) {
      args.push(resolver(nope)); 
    }
    
    return this.then.apply(this, args);
  };
  
  function resolver(cb) {
    return function(things) {
      things = Array.isArray(things) ? things : [things];
      return cb.apply(null, things);
    };
  }
}