Crossfilter query

Question

Is it possible to filter a crossfilter dataset which has an array as the value?

For example, say I have the following dataset:

var data = [
  {
    book         


        

Answer 1

I've never used "crossfilter" (I'm assuming this is a JS library). Here are some pure JS methods though.

This...

data.filter(function(d) {
  return d.authors.indexOf("Michael Fogus") !== -1;
})

returns this:

[{bookname:"the joy of clojure", authors:["Michael Fogus", "Chris Houser"], tags:["clojure", "lisp"]}]

This...

var res = {};
data.forEach(function(d) {
  d.tags.forEach(function(tag) {
    res.hasOwnProperty(tag) ? res[tag]++ : res[tag] = 1
  });
})

returns this:

({clojure:1, lisp:1, ruby:2, 'design patterns':1})

To either of these, you can apply d3.entries to get your {key:"ruby", value: 2} format.