useful LINQ (Language Integrated Query) operators available inside OutSystems applications. Instead of writing repetitive loops or complex logic to manipulate lists and record lists, developers can now use proven LINQ-based functions directly.

This library currently supports the following operators:

• Union – Combines two lists into a single list, removing duplicates.

• Intersect – Returns only the elements that exist in both lists.

• Except – Returns the elements that exist in the first list but not in the second.

• Concat – Appends one list to another, keeping duplicates if they exist.

• Distinct – Removes duplicate elements from a list.

Benefits

• Simplifies complex list operations into single function calls.

• Improves readability and maintainability of logic.

• Provides .NET-level performance for handling large collections.

• Reduces the need for custom looping, conditions, or temporary structures.

Use Cases

• Data merging – Combine results from multiple sources into one clean list.

• Duplicate removal – Get unique items from a record list.

• Filtering – Extract only shared values or exclude items based on another list.

• Workflow operations – Manage collections in approval processes, reporting, or synchronization.

Technical Notes

• Built with .NET Framework, compatible with OutSystems via Integration Studio.

• Designed for Record Lists and Entity Queries.

• Can be used in Reactive, Traditional Web, and Mobile OutSystems apps.

By using this library, developers can focus more on business logic rather than reinventing list-processing patterns, while still leveraging the robustness of Microsoft LINQ inside OutSystems.