Software Venture Consulting

FileMaker Pro downloads & Resources
FileMaker Custom Functions
FileMaker Web Viewer Examples
FileMaker Pro & Lasso Consulting
FileMaker Books
FileMaker Articles
FileMaker Error Reference

Free Web Tools
Free FileMaker Tools

Personal Pages

Shopping Cart
Shopping Cart


Free Newsletter


Privacy Policy

FileMaker is a registered trademark of FileMaker, Inc. in the U.S. and other countries.


 FileMaker Pro Custom Functions

List  |  Show Random  |  Upload  |  Add This to Your Site

ListAddUnique ( InList; InValue )

Rate this function:  

  Average rating: 4.7  (15 votes)
  Discuss this Custom Function

Richard DeShong, Logic Tools

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

Sample Input:
ListAdd ( "A¶B" ; "B" )
Sample Output:

 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


~~~ Design Notes ~~~

This is part of a series of LIST functions.
ListAdd, ListAddUnique, ListExist, ListGet, ListToggle.
Each uses the same name format: List<do what>
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"


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

This is my Custom Function and I want to edit it


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

eric, chicago
March 15, 2017 8:59am

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).

Richard DeShong, Berkeley, California
March 15, 2017 10:00am

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

Your Name:
characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
Answer 0 + 2 =
Search for Custom Functions:

Custom Functions Widget
Download the Custom Function Dashboard Widget for OS X
Keep all the latest Custom Functions right at your fingertips!

Newest Custom Functions:

1. ExcludeValues(MyList ; Out)
  (Wed, Mar 21, 7:23am)
2. PreviousMonthEndDate ( myDate )
  (Wed, Mar 07, 3:35am)
3. PreviousMonthName (myDate)
  (Wed, Mar 07, 3:33am)
4. FmTableFields ( tableName ; fieldsInclude ; fieldsExclude ; classExclude ; typeExclude ; prefixExclude )
  (Fri, Mar 02, 6:32am)
5. sql.getTable ( fullyQualifiedFieldObject )
  (Thu, Feb 22, 8:36am)
6. sql.getField ( fullyQualifiedFieldObject )
  (Thu, Feb 22, 8:34am)
7. FilterOut ( ListA ; ListB )
  (Wed, Feb 21, 6:11pm)
8. Char0 ( )
  (Sun, Feb 18, 2:35am)

RSS Feed of Custom Functions