HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>repeat sep</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent = [
      "ha".repeat(3),
      Array(3).fill("ha").join(" "),
      Array(4).fill("\u25CF").join("-")
    ].join("\n");
  </script>
</body>
</html>

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String.repeat() — separators (Try It)