LQ-Colligo

LQ-Colligo is a high-performance functional programming and collection manipulation library for Delphi and Lazarus, heavily inspired by C# LINQ and stream-processing APIs from Java, Kotlin, and Rust.

It provides two primary abstractions:

• ILQColligoEnumerable<T> — lazy pipeline for in-memory collections (arrays, lists).
• ILQColligoQueryable<T> — SQL-backed pipeline for database queries (requires FluentSQL + a DataEngine connection).

Where to start

• Introduction
• Installation
• Quickstart
• Troubleshooting

Guides

• Filtering collections
• Projections — Select / SelectMany
• Ordering collections
• Partitioning — Take / Skip
• Set operations — Union, Intersect, Concat, Exclude
• Joins and Zip
• Aggregations
• Grouping
• Querying the database (ILQColligoQueryable)
• Nullable types

Reference

• ILQColligoEnumerable API
• ILQColligoQueryable API
• Collections API (TLQColligoList, TLQColligoArray, TFluentDictionary)

Architecture

• Architecture overview

Scope

• Covers: lazy in-memory collection pipelines; SQL-backed DB pipelines via ILQColligoQueryable<T>; fluent collections (TLQColligoList<T>, TLQColligoArray<T>, TFluentDictionary<K,V>); nullable value helpers (LQColligoNullable<T>).
• Does not cover: JSON/XML providers (LQColligo.Json, LQColligo.Xml) — these units are stubs not yet implemented.