i><li name="react.core.ReactiveLibrary.Observable#observe" visbl="pub" data-isabs="true" fullComment="yes" group="Ungrouped">
      <a id="observe(f:A=&gt;Unit):react.core.ReactiveLibrary.Cancelable"></a>
      <a id="observe((A)⇒Unit):Cancelable"></a>
      <h4 class="signature">
      <span class="modifier_kind">
        <span class="modifier">abstract </span>
        <span class="kind">def</span>
      </span>
      <span class="symbol">
        <span class="name">observe</span><span class="params">(<s