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Streams à la carte: Extensible Pipelines with Object Algebras (Artifact) Biboudis, Aggelos Palladinos, Nick Fourtounis, George Smaragdakis, Yannis object algebras streams extensibility domain-specific languages expression problem library design In Streams à la carte we address extensibility shortcomings in libraries for lazy-streaming queries with a new design. The architecture underlying this design borrows heavily from Oliveira and Cook's object algebra solution to the expression problem, extended with a design that exposes the push/pull character of the iteration, and an encoding of higher-kinded polymorphism. In this library we apply our design to Java and show that the addition of full extensibility is accompanied by high performance, matching or exceeding that of the original, highly-optimized Java streams library. In this artifact we present a fundamental set of sequential operators map, filter, reduce, count, take/limit and iterate. Additionally we present the behaviors that are discussed in the paper: push, pull, fused pull, logging, id (for blocking terminal operators), future (for non-blocking terminal operators). Schloss Dagstuhl – Leibniz-Zentrum für Informatik Aggelos Biboudis and Nick Palladinos and George Fourtounis and Yannis Smaragdakis 2015 Is Part Of DARTS, Volume 1, Issue 1, Special Issue of the 29th European Conference on Object-Oriented Programming (ECOOP 2015) Article Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DARTS.1.1.9 urn:nbn:de:0030-drops-55189 https://drops.dagstuhl.de/entities/document/10.4230/DARTS.1.1.9 eng https://creativecommons.org/licenses/by/3.0/de/legalcode