Weird string to function thing using to-Function

hardly-functional

var fn = require('to-function');
function toObject(keys,values) {
  var rv = {};
  for (var i = 0; i < keys.length; ++i)
    if (keys[i] !== undefined) rv[keys[i]] = values[i];
  return rv;
}
function h(f) {
  var args = f.split("=>")[0].split(",");
  var func = f.split("=>")[1].split('-').map(function(fs){
    args.forEach(function(v){
      var exp = new RegExp(v,'g');
      fs = fs.replace(exp, "_."+v);
      console.log(v, exp);
    })
    fs = "_res = "+fs;
    console.log(fs);
    return fn(fs) ;
  });
  return function() {
    var argobj = toObject(args, arguments);
    var res;
    func.forEach(function(f) {
      res = f(argobj);
    })
    return res;
   }
}
var point = h('i,j=>{x:i,y:j}');
var pmul = h(
  'p,m=>p.x=p.x*m-'+
  'p.y=p.y*m-'+
  'p'
);
var three = h(
  'x,y=>point(x,y)-'+
  'pmul(_._res,3)'
)
module.exports = {h:h};
// and so:
three(1,1) // -> {x:3,y:3}