        <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="language-dart">int get length {
  assert(this is! EfficientLengthIterable);
  int count = 0;
  Iterator it = iterator;
  while (it.moveNext()) {
    count++;
  }
  return count;
}</code></pre>
        </section>
</section>
        
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