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  <title>Lodash _.tap() vs _.thru()</title>



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  <h1>_.tap() vs _.thru()</h1>



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



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



  <script>



    (function () {



      var viaTap = _.chain([1, 2, 3])

        .tap(function () { return [99]; })

        .value();



      var viaThru = _.chain([1, 2, 3])

        .thru(function () { return [99]; })

        .value();



      var lines = [

        "via tap:  " + JSON.stringify(viaTap),

        "via thru: " + JSON.stringify(viaThru)

      ];



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



    })();



  </script>



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Lodash _.tap() vs _.thru() (Try It)