Exclude JS source code from the output

_javascript/commons/back-to-top.js

@@ -0,0 +1,20 @@
+/*
+Reference: https://bootsnipp.com/snippets/featured/link-to-top-page
+*/
+$(function() {
+  $(window).scroll(() => {
+    if ($(this).scrollTop() > 50 &&
+      $("#sidebar-trigger").css("display") === "none") {
+      $("#back-to-top").fadeIn();
+    } else {
+      $("#back-to-top").fadeOut();
+    }
+  });
+
+  $("#back-to-top").click(() => {
+    $("body,html").animate({
+      scrollTop: 0
+    }, 800);
+    return false;
+  });
+});