Unique Array Comparison

By Zevan | March 20, 2009
CLICK HERE TO COPY
Actionscript:
  1. function uniqueCompare(arr:Array, compare:Function):void {
  2.     var leng:int = arr.length;
  3.     for (var i:int = 0; i<leng; i++){
  4.         for (var j:int = i + 1; j<leng; j++){
  5.             compare(arr[i], arr[j]);
  6.         }
  7.     }
  8. }
  9.  
  10. var numbers:Array = [1, 2, 3, 4, 5];
  11.  
  12. uniqueCompare(numbers, compareCallback);
  13.  
  14. function compareCallback(a:*, b:*):void {
  15.     trace("compare " + a + " to " + b);
  16. }
  17.  
  18. /*
  19. outputs:
  20. compare 1 to 2
  21. compare 1 to 3
  22. compare 1 to 4
  23. compare 1 to 5
  24. compare 2 to 3
  25. compare 2 to 4
  26. compare 2 to 5
  27. compare 3 to 4
  28. compare 3 to 5
  29. compare 4 to 5
  30. */

This snippet shows a function called uniqueCompare() that compares all elements in an array to all other elements in an array without repeating a comparison.

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