working out composition problems in Ramda

composition.js

// currently in Ramda:
var compose = R.compose = function() {  // TODO: type check of arguments?
  var fns = slice(arguments);
  return function() {
    return foldr(function(fn, args) {return [fn.apply(this, args)];}, slice(arguments), fns)[0];
  };
};

//...
var useWith = R.useWith = _(function(fn /*, tranformers */) {
  var tranformers = slice(arguments, 1);
  return function() {
    var args = [], idx = -1;
    while (++idx < tranformers.length) {
      args.push(tranformers[idx](arguments[idx]));
    }
    return fn.apply(this, args.concat(slice(arguments, tranformers.length)));
  };
});

// This does work:
function max() { return Math.max.apply(Math, arguments); }
function add1(x) { return x + 1; }
function mult2(x) { return x * 2; }
function div3(x) { return x/3; }

useWith(max, add1, mult2, div3)(4,5,6,7,8,9); // => 10


// THE PROBLEM IS, THIS DOESN'T WORK, once we wrap useWith in curry(nAry(...)):
// Reasonable analog to SQL `select` statement.
//
//     var kids = [
//         {name: 'Abby', age: 7, hair: 'blond', grade: 2},
//         {name: 'Fred', age: 12, hair: 'brown', grade: 7}
//     ];
//     project(['name', 'grade'], kids);
//     //=> [{name: 'Abby', grade: 2}, {name: 'Fred', grade: 7}]
R.project = useWith(map, pick);