Observable
**********

Read and Write
==============

For more information, see *Writeable computed observables* in
`Computed Observables`_

::

  function MyViewModel() {
      this.firstName = ko.observable('Planet');
      this.lastName = ko.observable('Earth');

      this.fullName = ko.computed({
          read: function () {
              return this.firstName() + " " + this.lastName(); 
          },
          write: function (value) {
              var lastSpacePos = value.lastIndexOf(" ");
              if (lastSpacePos > 0) { // Ignore values with no space character
                  this.firstName(value.substring(0, lastSpacePos)); // Update "firstName"
                  this.lastName(value.substring(lastSpacePos + 1)); // Update "lastName"
              }
          },
          owner: this
      });
  }
  ko.applyBindings(new MyViewModel());:


.. _`Computed Observables`: http://knockoutjs.com/documentation/computedObservables.html