text: 
  module.exports = function(RED) {
      "use strict";
  
      function SmoothNode(n) {
          RED.nodes.createNode(this, n);
          this.action = n.action;
          this.round = n.round || false;
          if (this.round == "true") { this.round = 0; }
          this.count = Number(n.count);
          this.mult = n.mult || "single";
          var node = this;
          var v = {};
  
          this.on('input', function (msg) {
              var top = msg.topic || "_my_default_topic";
              if (this.mult === "single") { top = "a"; }
  
              if ((v.hasOwnProperty(top) !== true) || msg.hasOwnProperty("reset")) {
                  v[top] = {};
                  v[top].a = [];
                  v[top].tot = 0;
                  v[top].tot2 = 0;
                  v[top].pop = 0;
                  v[top].old = null;
                  v[top].count = this.count;
              }
              if (msg.hasOwnProperty("payload")) {
                  var n = Number(msg.payload);
                  if (!isNaN(n)) {
                      if ((node.action === "low") || (node.action === "high")) {
                          if (v[top].old == null) { v[top].old = n; }
                          v[top].old = v[top].old + (n - v[top].old) / v[top].count;
                          if (node.action === "low") { msg.payload = v[top].old; }
                          else { msg.payload = n - v[top].old; }
                      }
                      else {
                          v[top].a.push(n);
                          if (v[top].a.length > v[top].count) { v[top].pop = v[top].a.shift(); }
                          if (node.action === "max") {
                              msg.payload = Math.max.apply(Math, v[top].a);
                          }
                          if (node.action === "min") {
                              msg.payload = Math.min.apply(Math, v[top].a);
                          }
                          if (node.action === "mean") {
                              v[top].tot = v[top].tot + n - v[top].pop;
                              msg.payload = v[top].tot / v[top].a.length;
                          }
                          if (node.action === "sd") {
                              v[top].tot = v[top].tot + n - v[top].pop;
                              v[top].tot2 = v[top].tot2 + (n*n) - (v[top].pop * v[top].pop);
                              if (v[top].a.length > 1) {
                                  msg.payload = Math.sqrt((v[top].a.length * v[top].tot2 - v[top].tot * v[top].tot)/(v[top].a.length * (v[top].a.length - 1)));
                              }
                              else { msg.payload = 0; }
                          }
                      }
                      if (node.round !== false) {
                          msg.payload = Math.round(msg.payload * Math.pow(10, node.round)) / Math.pow(10, node.round);
                      }
                      node.send(msg);
                  }
                  else { node.log("Not a number: "+msg.payload); }
              } // ignore msg with no payload property.
          });
      }
      RED.nodes.registerType("smooth", SmoothNode);
  }
  