class app.collections.Types extends app.Collection  @model: 'Type'   groups: ->    result = []    for type in @models      (result[@_groupFor(type)] ||= []).push(type)    result.filter (e) -> e.length > 0   GUIDES_RGX = /(^|\()(guides?|tutorials?|reference|book|getting\ started|manual|examples)($|[\):])/i  APPENDIX_RGX = /appendix/i   _groupFor: (type) ->    if GUIDES_RGX.test(type.name)      0    else if APPENDIX_RGX.test(type.name)      2    else      1