3_mapreduce.coffee

# define the reduce function 
# this function is called for every emit emitted 
# from the map function above 
# in this example we'll count all the fruit by 
# type and also keep a tally for the baskets

reduceFunc = (key, values) -> 
    count = 0 
    baskets = 0 
    values.forEach (value) -> 
        count += value.count 
        baskets += value.baskets 
    return { 
        fruit: key, 
        count: count, 
        baskets: baskets 
    }