gistfile1.js

[...]
    inputs: {
      init: function() {
        Array.prototype.forEach.call(kashoderkurs.inputs, function(index, value) {
          console.log(index, value);
        });
      },
      // This is how we do it
      cash: new (function() {

        // Because e.g. private variables here...
        var priv = '1337';

        // or functions
        var privateFunction = function() { console.log('Not callable from outside!');}


        this.init = function() {
          kashoderkurs.cash.addEventListener('input', this.update());
        };
        this.update = function() {
          var value = kashoderkurs.cash.value;
          var rateValue = kashoderkurs.rate.value;
          var unitValue = kashoderkurs.unit.value;

          if (!parseInt(rateValue)) {
            unit.value = 0;
            return;
          }

          var newUnitValue = (value / rateValue).toFixed(2);
          if (newUnitValue.match(/.00/)) {
            newUnitValue = parseInt(newUnitValue);
          }

          kashoderkurs.unit.value = newUnitValue;
        };
      })(),
     [...]
});