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 FileMaker Pro Custom Functions

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joinRepeatingVariable ( variableName ; delimiter ; startIndex ; endIndex )

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  Average rating: 3.9  (57 votes)
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Sam Barnum, 360Works

Join / concatenate a repeating variable / array using a delimiter character

Sample Input:
joinRepeatingVariable("$$foo" ; ", " ; "" ; "")
Sample Output:

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


Join a repeating variable / array with a delimiter, using recursion.

If endIndex is not specified or is negative, the recursion will exit on the first empty element in the array. Otherwise, empty elements will be included in the results until endIndex is reached.

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


Also works for repeating fields!

Bruce Robertson, Redmond WA
March 14, 2011 5:00pm

The CF assumes that N for $var[N] is positive. Actually (unlike repeating fields) it can be zero; or negative; though it must always be an integer. In practice I suppose negative or zero values for N are rare.

Bruce Robertson, Redmond WA
March 14, 2011 5:06pm

Interesting point, Bruce. If this function were to support negative indices, the empty-arg approach would require a way to iterate backwards to find the first non-empty value. Currently if no startIndex is specified 1 is assumed.

Sam Barnum, San Francisco
March 14, 2011 5:13pm

Perfect. Thank you Sam!

David Walton, Wellfleet, MA
June 27, 2011 11:00am

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Answer 9 + 1 =
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