s.
If a broadcast stream is listened to more than once, each subscription
will individually perform the <code>test</code>.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">Stream&lt;T&gt; where(bool test(T event)) {
  return new _WhereStream&lt;T&gt;(this, test);
}</code></pre>
    </section>

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