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<head>
  <meta charset="utf-8">
  <title>Lodash _.overArgs parseInt</title>
</head>
<body>
  <h1>Sum parsed strings</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var sum = _.overArgs(
        function (a, b) {
          return a + b;
        },
        [
          function (x) {
            return parseInt(x, 10);
          },
          function (x) {
            return parseInt(x, 10);
          }
        ]
      );
      document.getElementById("out").textContent = JSON.stringify(
        { result: sum("12", "30"), typeofResult: typeof sum("12", "30") },
        null,
        2
      );
    })();
  </script>
</body>
</html>

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Lodash _.overArgs — parse ints before sum (Try It)