lift Promise

liftP.js

var R = require('ramda');
var Promise = require('bluebird');

var liftP2 = R.curry(function(fn, p1, p2) {
  return Promise.all([p1, p2]).then(R.apply(fn));
});

R.lift(R.add)([1], [2])
// => [3]

liftP2(R.add)(Promise.resolve(1), Promise.resolve(2))
.then(console.log);
// => 3

var liftP = function(fn) {
  return function() {
    return Promise.all(R.slice(0, Infinity, arguments)).then(R.apply(fn));
  };
};

liftP(R.add)(Promise.resolve(1), Promise.resolve(2)).then(console.log)
// => 3