List.IndexOf returning null or -1 depending on the Dynamo version

Revit
1

I’ve run into a problem with a script between Dynamo versions 2.19 and 3.3. Typically I do a save as from 2,19 and open the script in 3.3, update to the packages relevant for 3.3.

However, we’ve run into a problem with one script not working the same between 2.19 and 3.3, and I’ve realized the List.IndexOf gives different results when out of range.

In 2.19 I get a -1, see index 2.

image
image1103×775 212 KB

While in 3.3 the result is a null, see below

image
image952×615 194 KB

Is this known behavior, are there any other nodes which are like this and have different outputs between Dynamo versions?

2

Yes, and yes.

See the release notes for insights on changes of behavior, including this note in 3.3: Release Notes · DynamoDS/Dynamo Wiki · GitHub.

3

If you wanna get rid of ‘that’ you could use List.AllIndicesOf.

image
image708×569 52.2 KB

4

I need to keep a better eye on the release notes!

@bvs1982 I will make this change.

I’m happy I noticed this going wrong now and that I’m aware of it, will have to look back on a few old scripts to check for it.

1 Like