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  <title>Lodash _.mean — dirty data</title>
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  <h1>_.mean — strings, null, undefined, NaN</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var dirty = [10, "20", null, "abc", 30];
      var clean = dirty.map(Number).filter(Number.isFinite);
      var lines = [
        '_.mean([10, "20", 30])     => ' + _.mean([10, "20", 30]),
        '_.mean(["10", "20", "30"]) => ' + _.mean(["10", "20", "30"]),
        "_.mean([10, undefined, 20]) => " + _.mean([10, undefined, 20]),
        "_.mean([10, null, 20])      => " + _.mean([10, null, 20]),
        "_.mean([10, NaN, 20])       => " + _.mean([10, NaN, 20]),
        "",
        "After .map(Number).filter(Number.isFinite):",
        "  clean = " + JSON.stringify(clean),
        "  _.mean(clean) = " + _.mean(clean)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.mean — dirty data (Try It)