HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array reduce() — flatten</title>
</head>
<body>
  <h1>reduce() — flatten</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var nested = [[1, 2], [3, 4], [5, 6]];
      var flat = nested.reduce(function (acc, chunk) {
        return acc.concat(chunk);
      }, []);
      document.getElementById("out").textContent = JSON.stringify(flat);
    })();
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript Array reduce() — flatten (Try It)