Get Distinct List of items

De-duplicate your collections in PowerApps

When you have large arrays or collections of data and and the data has duplicates, it can be difficult to to de-duplicate your data in PowerApps. There is a Distinct function which returns a unique list of values however that only works on a single field. So that is great for filling drop downs but not very good when you want to fill a gallery with data.

In this post I will describe an easy way to solve this problem.


I started by creating  a collection that looks like this:

[{Title:"Item1", Description: "Description 1"},
{Title:"Item1", Description: "Description 1"},
{Title:"Item2", Description: "Description 2"},
{Title:"Item3", Description: "Description 3"},
{Title:"Item3", Description: "Description 3"}

Within a Gallery this could look like this:
Large list of items in a Gallery

As you can see I’ve got 5 items and 2 of them are duplicates

To get my gallery to display the items I’m setting the OnStart of my app to:

ClearCollect(MyItems, {Title:"Item1", Description: "Description 1"},{Title:"Item1", Description: "Description 1"},{Title:"Item2", Description: "Description 2"},
{Title:"Item3", Description: "Description 3"},
{Title:"Item3", Description: "Description 3"}

Now I can use the distinct function to create myself an index unique items

ClearCollect(MyIndex, Distinct(MyItems, Title));

Using the MyIndex I can now create a gallery of list itemsIndex the items

However this still doesn’t give me all the columns.

Now setting the label value to:

First(Filter(MyItems,Title = ThisItem.Result)).Description

Get Distinct List of items


Other related articles

Unique items with Distinct function


2 thoughts on “De-duplicate your collections in PowerApps

  1. commented on March 25, 2020 by Fernando Moura

    Genius!! Saved my life!

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