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 FileMaker Pro Custom Functions

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RemoveCommonValues ( Array ; ComparisonArray )

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  Average rating: 4.6  (31 votes)
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Bob Kalus, KaluBo
bobearl.org

Filter array by comparison array to remove the common values

Sample Input:
RemoveCommonValues ( 1¶2¶3¶4¶5¶6¶7¶;2¶4¶6¶8¶10¶12¶14¶ )
Sample Output:
1¶3¶5¶7


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed

Description:

Function removes the values an array has in common with a second array. I found I needed this function to check that two fields used as a multikey for a relationship (first field in equijoin, second field in a non-equijoin) are mutually exclusive.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it

Discuss:

Hi Bob,
very good function, just searched for this functionality to subtract lists from each other to get an exclusive list.
I jut want to say, that I removed the "& ¶" after leftValues(Array;1) in the 5th line. This creates no empty lines in the result list

Cheers
Erik

Erik Jutzi, Germany
March 13, 2010 4:14am

Bob,

As Erik notes, very useful. To be precise, I notice it returns the left-hand complement. That is, if you run

RemoveCommonValues ("1¶2¶3"; "2¶3¶4")

the return value is "1" (not, "1¶4").

This is fine -- just means you have to run it twice, with the arrays in reverse order, to get the complete complementary set. Doing so, and concatenating with FilterValues on the same pair of arrays gives you the index of the combined arrays -- nice! Needless to say, this could itself be written as a custom function.

Vincent

Vincent Robinson, San Francisco
September 07, 2012 4:40pm

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