little javascript helper

helpers.js

// requires Underscore.js
var helpers = {
  // Takes object and converts key / values to a sentence
  //
  // Sample usage:
  //
  //    obj = {"this" : "is good", "that" : "is bad", "those" : "are great"}
  //
  //    helpers.to_sentence(obj)
  //    # "this is good, that is bad, and those are great"
  //
  to_sentence: function(obj) {
    var keys = _.keys(obj),
           i = 0;

    return _.reduce(keys, function(memo, k) {
      memo += k + ' ' + obj[k];
      if      (keys.length == i + 1) ; // do nothing
      else if (keys.length == i + 2) memo += ', and '
      else if (keys.length > i)      memo += ', '
      i += 1;
      return memo;
    }, '');
  }
};

// alias it to _h for easy access! or don't. whatever
var _h = helpers;