http://ghafoorsblog.com/tags/langchain-patterns/Recent content in Langchain-Patterns on Ghafoor's Personal BlogHugoennoreply@example.com (AG Sayyed)noreply@example.com (AG Sayyed)Copyright © 2024-2026 AG Sayyed. All Rights Reserved.Fri, 15 May 2026 13:20:20 +0100http://ghafoorsblog.com/courses/ibm/rag-agentic-ai-content/rag-agentic-ai-pcert/01-develop-genai-apps/01-module/008-lcel/Fri, 21 Nov 2025 02:20:39 +0000noreply@example.com (AG Sayyed)http://ghafoorsblog.com/courses/ibm/rag-agentic-ai-content/rag-agentic-ai-pcert/01-develop-genai-apps/01-module/008-lcel/<p class="lead text-primary"> This document explores LangChain Expression Language (LCEL), a modern pattern for building LangChain applications using the pipe operator to connect components. It covers the fundamentals of creating flexible chains, structuring prompts with templates, understanding runnable composition primitives, and leveraging type coercion to develop reusable patterns for various AI applications with improved composability and data flow visualization. </p> <hr> <h2 id="introduction-to-lcel">Introduction to LCEL</h2> <p>LangChain Expression Language (LCEL) is a pattern for building LangChain applications that utilizes the pipe operator to connect components. This approach ensures a clean, readable flow of data from input to output.</p>