Grouping contiguous values

[filemakernewb2011]

I'm having trouble with a function to do the following:

Given an array of values, for example:

2

3

4

7

8

11

13

14

15

How can I group them in an array like so:

2-4

7-8

11

13-15

[comment]

See if this helps:

http://www.briandunning.com/cf/734

[filemakernewb2011]

Perfect.. Thanks!