Members.filter for DateTime items

[rossko57]

@jwiseman

if (gDimmerLastChange.members.filter[... )

That’s an unusual construction.
The Group filter will return a list object.
The if() will try to evaluate the list as true or false; if the list is empty (null) I expect that will be false, not sure if any non-zero list would be true?
In either case, the list is then thrown away before executing the next line.

This might help if you really want to test list/no-list

Using .members.filter

It really helps if you post your code using code fences so the forum property formats it: ``` your code here ``` Two things with filter. I think you have to use square brackets, not parens Filter returns a List object containing all the Items that match the filter So the line should be: if(Sensor.members.filter[s|s.name == mm].size > 0) // there is at least one Item named mm

@jwiseman

s.state === null

This never happens and can be removed,

General guidance

Design Pattern: Working with Groups in Rules

Edit: Updates for OH 4, inclusion of JS Scripting and Blockly examples, removed the doors example as it’s superfluous. Please see Design Pattern: What is a Design Pattern and How Do I Use Them for how to read and use DPs. Problem Statement One powerful way to consolidate code in rules is to use array/list manipulation operations on the members of a Group. For example, filter down to just those members that are ON, get a list of the labels of those Items that are NULL, etc. Concept [image] T…

I would imagine you want to forEach through your filtered list