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Posted By

elightbo on 04/06/10


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array ASP


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ASP Shuffle Array

 / Published in: ASP
 
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  1. 'From http://www.4guysfromrolla.com/aspfaqs/ShowFAQ.asp?FAQID=114
  2. Function Shuffle( inArray, needed )
  3.     ' find out how many input elements there are...
  4.     incnt = UBound( inArray )
  5.     ' then create the output array to be the size
  6.     ' requested via the "needed" argument
  7.     dim outArray
  8.     redim outArray( needed )
  9.  
  10.     ' now we will select the number of values
  11.     ' specified as "needed"...
  12.     For i = 0 To needed
  13.         ' choose a random number from 1 to our
  14.         ' current input array usage size...
  15.         choose = Int( incnt * Rnd(1) ) 
  16.  
  17.         ' put that chosen element into the next
  18.         ' slot in the output array...
  19.         outArray( i ) = inArray( choose )
  20.  
  21.         ' here's the tricky part: Since we just
  22.         ' used the "choose" element, we don't need
  23.         ' it any more...we replace it with the last
  24.         ' element of the in-use part of the array!
  25.         inArray( choose ) = inArray( incnt )
  26.  
  27.         ' and then we (effectively) shrink the array!
  28.         ' Next time through the loop, there will be
  29.         ' one fewer elements in the array to choose
  30.         ' from...because we have (effectively) deleted
  31.         ' the one just chosen!
  32.         incnt = incnt - 1
  33.  
  34.     Next
  35.     ' return the shuffled output
  36.     Shuffle = outArray
  37. End Function

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