code: function(array, n) {
        var ret = [];
        var sz = _.size(array);
  
        if (n <= 0) return [];
        if (n === 1) return array;
  
        for(var index = 0; index < sz; index += n) {
          ret.push(array[index]);
        }
  
        return ret;
      }
docs: Takes every nth item from an array, returning an array of the results.