crossfilter sample code

cf.coffee

data = [{fld1: 'type1', fld2: 10},...]
cf = crossfilter(data)

# create dimension
dim1 = cf.dimension (d) -> return d.fld1
dim2 = cf.dimension (d) -> return d.fld2

# create group
group = dim2.group (fld2) -> return fld2 % 5

# creaate reducer
sumAdd = (p, v) -> return p + v
sumReduce = (p, v) -> return p - v
reducer = group.reduce sumAdd, sumRemove, 0

# filtering
dim1.filter('type1')

# get result
console.log reducer.top(3)