Brian Dunning's FileMaker Custom Functions

ListAddUnique ( InList ; InValue )

Add given value, InValue, to given list, InList, but only if not already in list.

  Average rating: 4.6 (15 votes) Log in to vote

Richard DeShong   Richard DeShong - Show more from this author
Logic Tools

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  Sample input:
ListAdd ( "A¶B" ; "B" )
  Sample output:

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

~~~ Design Notes ~~~

This is part of a series of LIST functions.
ListAdd, ListAddUnique, ListExist, ListGet, ListToggle.
Each uses the same name format: List
Each uses the same parameter format: InList; InValue.

They also work in concert with two SET functions:
SetVar and SetField
These are all designed to work with variables and to
keep the variables from being un-set (removed from memory),
by using the string "Empty" to indicate IsEmpty().
If a field, MyField, is empty and I use SetVar(),
MyVariable = SetVar( MyField )
Tnen MyVariable is now = "Empty"




Eric   Eric, SJSU
Mar 15, 2017
This is awesome! would you consider being able feed a list of values to add if any one is unique?

in other words. make sure this list of values contains this other list of values
Richard DeShong   Richard DeShong, Logic Tools
Mar 15, 2017
Hi Eric, what you are asking sounds like a list merge. For a non-recursive version of merging two lists, check out Michael Rhodes' MergeLists(_array1;_array2).

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

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