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(function($) {
  $.mathUtils = {
    sum: function(array) {
      var total = 0;

      $.each(array, function(index, value) {
        total += $.mathUtils.parseCzechFloat(value);
      });
      return total;
    },
    parseCzechFloat: function(string) {
      var value = $.trim(string);
      return parseFloat(value.replace(' ', '').replace(',', '.')) || 0;
    },
    formatCzechFloat: function(number) {
      return String(number).replace('.', ',');
    },
    average: function(array) {
      if ($.isArray(array)) {
        return $.mathUtils.sum(array) / array.length;
      }
      return '';
    }
  };
})(jQuery);