CFLib.org – Common Function Library Project

ListDiff(list1, list2[, delimiters])

Last updated June 26, 2002

author

Ivan Rodriguez

Version: 1 | Requires: CF5 | Library: StrLib

Description:
Compares two lists and returns the elements that do not appear in both lists.

Return Values:
Returns a string.

Example:

<CFOUTPUT>
ListDiff("1,2,3","1,3,4,5"): #ListDiff("1,2,3","1,3,4,5")#
</CFOUTPUT>

Parameters:

Name Description Required
list1 First list to compare Yes
list2 Second list to compare Yes
delimiters Delimiter for all lists. Defualt is comma. No

Full UDF Source:

/**
 * Compares two lists and returns the elements that do not appear in both lists.
Returns a list that contains the elementsrest between list1 and list2
 * 
 * @param list1 	 First list to compare (Required)
 * @param list2 	 Second list to compare (Required)
 * @param delimiters 	 Delimiter for all lists.  Defualt is comma. (Optional)
 * @return Returns a string. 
 * @author Ivan Rodriguez (wantez015@hotmail.com) 
 * @version 1, June 26, 2002 
 */
function ListDiff(list1,list2)	{
  var delimiters	= ",";
  var listReturn = "";
  var position = 1;

  // default list delimiter to a comma unless otherwise specified	
  if (arrayLen(arguments) gte 3){
    delimiters	= arguments[3];
  }
		
  //checking list1
  for(position = 1; position LTE ListLen(list1,delimiters); position = position + 1) {
    value = ListGetAt(list1, position , delimiters );
    if (ListFindNoCase(list2, value , delimiters ) EQ 0)
      listReturn = ListAppend(listReturn, value , delimiters );
    }
		
    //checking list2
    for(position = 1; position LTE ListLen(list2,delimiters); position = position + 1)	{
      value = ListGetAt(list2, position , delimiters );
      if (ListFindNoCase(list1, value , delimiters ) EQ 0)
        listReturn = ListAppend(listReturn, value , delimiters );
  }
  return listReturn;
}
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