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  <title>Lodash _.thru() - map then custom filter</title>



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  <h1>_.thru() - map then custom filter</h1>



  <pre id="out"></pre>



  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>



  <script>



    (function () {



      var intermediate = "";



      var result = _([1, 2, 3])

        .map(function (x) { return x * 2; })

        .thru(function (collection) {

          intermediate = JSON.stringify(collection);

          return collection.filter(function (x) { return x > 3; });

        })

        .value();



      var lines = [

        "intermediate: " + intermediate,

        "result:       " + JSON.stringify(result)

      ];



      document.getElementById("out").textContent = lines.join("\n");



    })();



  </script>



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Lodash _.thru() - map then custom filter (Try It)