Reductio JSON

reductio_json.coffee

reductio = require 'reductio'
_ = require 'lodash'

makeTemplate = (config)->
    if !type.call(config) == '[object String]'
        return ()-> 'unknown'
    if ~config.indexOf '<%'
        templ = _.template config
        tpl = (d)-> templ d:d
    else
        tpl = (d)-> d[config]
    tpl

reductio_json = (config)->
    reducer = reductio()
    if config.values
        for k,v of values
            as_reductio.value reducer, k, v
    for k,v of config
      as_reductio[k](reducer,v) if k != 'values'
    reducer

reductio_json.value = (reducer, val, config)->
    red = reducer.value val
    for k,v of config
        as_reductio[k](red, v)

reductio_json.groupAll = (reducer, config)->
    tpl = makeTemplate config
    reducer.groupAll (d)-> (tpl(d) || '').split(',')

base = ['count', 'avg', 'sum']

for name in base
    reductio_json[name] = (reducer, config)->
        if type.call(config) == '[object String]'
            if !~config.indexOf('<%')
                reducer[name](config)
            else
                tpl = makeTemplate config
                reducer[name](tpl)
        else
            reducer[name](config)
            
module.exports = reductio_json

usage.md

Usage

var reductio = require('reductio_json'),
    crossfilter = require('crossfilter');

var items = [
  {category: 'mine,yours,theirs', items: 4},
  {category: 'mine', items: 13},
  {category: 'yours,theirs', items: 22}
];

var cf = crossfilter(items);

var dimension = cf.dimension(function(d){return d.category;});

var reducerConfig = {
  groupAll: 'category',
  sum: 'items'
};

var group = reductio_json(reducerConfig)(dimension.groupAll());

console.log(group.all());
// [{"key":"mine","value":{"sum":17}},{"key":"theirs","value":{"sum":26}},{"key":"yours","value":{"sum":26}}]