Utilizing crossfilter and DC.js to perform reduce() on groupAll() operation

This task seems deceptively simple :/

I've been following the crossfilter API instructions on running a reduce operation on groupAll: https://github.com/square/crossfilter/wiki/API-Reference#groupAll_reduce

However, despite my efforts, I can't seem to make it work. I've attempted using facts.groupAll() with var facts = crossfilter(data); and also tried all.reduce() with var all = facts.groupAll(). I've experimented with parentheses both present and absent, and even searched online for examples. Does anyone have a functional example that they could share? My goal is to generate a single output covering all rows.

Upon reflection, I realize that my reduce function is incomplete and appears intricate. While it operates smoothly when reducing a dimension, it returns undefined for groupAll on facts.

Thank you

  var accumGrp = facts.groupAll().reduce(
    function(p,v) {
      for (var i=0; i<supplierFields[0].length; i++) {
        if (!p.population[supplierFields[0][i]]) { p.population[supplierFields[0][i]] = []; }
        p.population[supplierFields[0][i]].push(v[supplierFields[0][i]+'_l']);
      }
      return p;
    },
    function(p,v) { return p; },
    function() {
      var obj = {};
      obj.population = {};
      obj.highlight = {};
      return obj;
    }
  );

  print_filter('accumGrp');

Answer №1

Your main issue lies in the fact that you must call groupAll.value() to trigger the group aggregation process. Regular groups compute aggregations upon definition or data loading, not when queried with group.top or group.all.

Despite this, your general approach seems correct. Without knowledge of what print_filter does, it's only a guess. Try adding console.log(accumGrp.value()) at the end of your code to see if it resolves the problem.

If not, below is a simple working example for reference:

var info = [4,8,12,16]

var cf = crossfilter(info)
var group = cf.groupAll().reduce(
  function(x, y) { return x + y },
  function(x, y) { return x - y },
  function() { return 0 }
)

console.log(group.value())

This will output 40. You can also explore a live JSFiddle with additional console statements to aid troubleshooting: https://jsfiddle.net/johndoe/9s3rkg6t/

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