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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Lodash _.debounce cancel flush</title>
</head>
<body>
  <h1>cancel() and flush()</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var log = [];
      var push = _.debounce(function (v) {
        log.push(v);
      }, 300);
      push("A");
      push.cancel();
      push("B");
      push.flush();
      document.getElementById("out").textContent = JSON.stringify(log);
    })();
  </script>
</body>
</html>

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Lodash _.debounce — cancel & flush (Try It)