Creating a unique collection in flow

this is a very short post, that shows one small thing that can be very useful - creating a collection of unique elements in visual workflow

there are now quite a few operators on collections in flow, but none of them are ‘remove duplicates’ or ‘add if new’ or anything like that.

i found a way to do this that requires only a single assignment element - no loops or decisions required

step 1 : remove all instances of (X)
step 2: add (X)


this ensures that your collection will only contain one copy of the element.

maybe there is an easier way, but this works!


Now read this

Visualforce page to embed the flow on

This post is part of a series on building a replacement for stay-in-touch using visual workflow The visualforce page is very simple, no controller required. It is designed to pull the contact ID from the query string (the URL). This help... Continue →