Module version of plumb

plumb.js

"use strict";
var plumb = (function (initial_data) {
  
  // Properties
  ///////////////////////////
  
  var raw_data = [];
  var data = [];   
  
  var load = function(raw_data,data) {
            this.raw_data = raw_data;
            this.data = data;
            };

   var generateKey = function(plumber) {
                this.keyPlumber = plumber;
                this.data = [];
                var data_plumb = this;
                this.raw_data.forEach(function(record) {
                    data_plumb.data[data_plumb.keyPlumber(record)] = {};
                });
                return this;
            }

    var meanField = function(field,label) {
                var data_plumb = this;
                this.raw_data.forEach(function(record) {
                    if(data_plumb.data[data_plumb.keyPlumber(record)][label] === undefined) { //this assumes first run
                        data_plumb.data[data_plumb.keyPlumber(record)][label] = 0;
                        data_plumb.data[data_plumb.keyPlumber(record)]["keyCount"]  = 0;
                    }
                    data_plumb.data[data_plumb.keyPlumber(record)][label] += record[field];
                    data_plumb.data[data_plumb.keyPlumber(record)]["keyCount"] = data_plumb.data[data_plumb.keyPlumber(record)]["keyCount"]+1;
                });

                this.data.forEach(function(record) {
                    record[label] /= record["keyCount"];
                });
                return this;
            }

    var maxField = function(field,label) {
                var data_plumb = this;
                this.raw_data.forEach(function(record) {
                    if(data_plumb.data[data_plumb.keyPlumber(record)][label] === undefined || record[field] > data_plumb.data[data_plumb.keyPlumber(record)][label]) {
                        data_plumb.data[data_plumb.keyPlumber(record)][label] = record[field];
                    }
                });
                return this;
            }

    var minField = function(field,label) {
                var data_plumb = this;
                this.raw_data.forEach(function(record) {
                    if(data_plumb.data[data_plumb.keyPlumber(record)][label] === undefined || record[field] < data_plumb.data[data_plumb.keyPlumber(record)][label]) {
                        data_plumb.data[data_plumb.keyPlumber(record)][label] = record[field];
                    }
                });
                return this;
            }
  
    raw_data = initial_data;
  
    // Reveal public methods
    return {
        raw_data: raw_data,
        data: data,
        load: load,
        generateKey: generateKey,
        meanField: meanField,
        maxField: maxField,
        minField: minField
      };
  
})();