jQuery/CoffeeScript: hide div if all radios are false, but show if any is true -

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i have div need shown if user answers yes (clicks "true" radio) of 4 questions. if answer false all, hide div. i've been having trouble if user changes his/her mind , goes , chooses other option on question. i've written coffeescript method handle it:

$ ->   numberfalse = 0   numbertrue = 0   hideifallno = ->     $('.legal-information').find('input[type=radio]').each ->       if $(this).is(':checked') , $(this).val() 'false'         if numberfalse >= 4 return else numberfalse += 1         if numbertrue >= 1 numbertrue -= 1 else numbertrue = 0       else if $(this).is(':checked') , $(this).val() 'true'         if numbertrue >= 4 return else numbertrue += 1         if numberfalse >= 1 numberfalse -= 1 else numberfalse = 0     if numberfalse 4       $('.legal-info-extra-info').slideup('fast')     if numbertrue >= 1       $('.legal-info-extra-info').slidedown('fast')    $('.legal-information input[type=radio]').on 'change', ->     hideifallno()

the issue here (other potentially questionable style choices; feel free weigh in on those, too) user can increment numberfalse or numbertrue clicking , forth on same 2 radio buttons single question. @ point, or if go , make different selections on multiple questions, counts messed up. had considered appending elements array , counting array length, got messy. how should handle user changing his/her mind?

edit

i've tried store true , false values in attributes on object, calling $('.legal-information').find('input[type=radio]:checked').attr('value','true'); sets value true. there way array of true attrs?

does these local variables holding amount of true , false radios used elsewhere? if no, can skip sum , show div on true checked this:

$ ->   $('.legal-information input[type=radio]').on 'change', ->     if $('.legal-information input[type=radio][value=true]:checked').length  > 0       $('.legal-info-extra-info:hidden').slidedown('fast')     else       $('.legal-info-extra-info:visible').slideup('fast')

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