title: Bind multiple inputs to the same variable in observable array (Knockout.JS)
body: <p>I want to bind and change multiple inputs to the same variable (so that they will always change together to the same value), but I can not figure this out. My code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>        $(function () {
              var AppVm = function () {
                  this.people = ko.observableArray([
                      { firstName: 'Bert', lastName: 'Bertington' },
                      { firstName: 'Charles', lastName: 'Charlesforth' },
                      { firstName: 'Denise', lastName: 'Dentiste' }
                  ]);
              };
              vm = new AppVm();
              ko.applyBindings(vm);
          });</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"&gt;&lt;/script&gt;
  &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;table&gt;
          &lt;thead&gt;
              &lt;tr&gt;&lt;th&gt;First name&lt;/th&gt;&lt;th&gt;Last name&lt;/th&gt;&lt;/tr&gt;
          &lt;/thead&gt;
          &lt;tbody data-bind="foreach: people"&gt;
              &lt;tr&gt;
                  &lt;td&gt;
                  &lt;input type="text" data-bind="textInput: firstName"/&gt;
                  &lt;/td&gt;
                  &lt;td&gt;
                  &lt;input type="text" data-bind="textInput: firstName"/&gt;
                  &lt;/td&gt;
              &lt;/tr&gt;
          &lt;/tbody&gt;
      &lt;/table&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>It loads the same value initially in both the text inputs, but when I change one of them , the other one does not update. How can I update them both at the same time?</p>