David's quiz

gistfile1.coffee

_ = require 'underscore'

class SurveyResponse
  constructor: (@site, @results) ->

default_result = 
  'csharp': 0
  'fsharp': 0
  'haskell': 0
  'ruby': 0
  'javascript': 0 

data = [
  new SurveyResponse('site1', {'csharp':3, 'fsharp': 1, 'haskell': 0}),
  new SurveyResponse('site2', {'csharp':3, 'ruby':5}),
  new SurveyResponse('site3', {'ruby':7, 'javascript': 4})
]

survey_to_csv = (d) ->
  normalize_surveys d
  format d

normalize_surveys = (d) ->
  for survey in data
    survey.results = _.extend {}, default_result, survey.results

format = (d) ->
  """
  site,#{(key for key,value of default_result).join()}
  #{format_sites d}
  """

format_sites = (ss) ->
  ("#{s.site},#{value for key,value of s.results}\n" for s in ss).join('')

console.log survey_to_csv data