underscore vs functional

//underscore way (from Functional JavaScript, already publicly available here:
//http://cdn.oreillystatic.com/oreilly/booksamplers/9781449360726_sampler.pdf)
function lameCSV(str) {
  return _.reduce(str.split("\n"), function(table, row) {
    table.push(_.map(row.split(","), function(c) { return c.trim()}));
    return table;
  }, []);
};
console.log(lameCSV("name,age,hair\nMerble,35,red\nBob,64,blonde"));

//more functional way
function split(separator, string){
  if (is("Array", string))
    return string.map(split.bind(0, separator));
  return string.split(separator);
};
var splitRow = split.bind(0, "\n");
var splitCell = split.bind(0, ",");
var coolCSV = compose(splitCell, splitRow);
console.log(coolCSV("name,age,hair\nMerble,35,red\nBob,64,blonde"));

//Utils
function is(type, object){
  return toString.call(object) === '[object ' + type + ']';
};
function compose(fn1, fn2){
  return function(){
    return fn1.call(this,fn2.apply(this, arguments));
  }
};