🧪TDD Challenge·beginner·⏱️ 25–40m·⭐ 125 XP
M-077Build a LangChain-Style Processing Chain
Description
Nebula Corp wants to adopt a chain-based architecture for their AI pipelines. Build a simplified LangChain-style chain system where each step transforms the input and passes it to the next. Implement a chain builder that supports sequential steps, conditional branching, and error handling — the core patterns used in LangChain's LCEL.
Test Cases (3)
Basic chain processes input
Chain should process through all steps
Input:testBasicChain()
Expected:CONTAINS:tokenCount
Conditional chain branches correctly
Should take the if-branch for help text
Input:testConditionalChain()
Expected:CONTAINS:support
Error handling catches failures
Should catch error when tokens array is missing and report the failed step
Input:testErrorHandling()
Expected:CONTAINS:countTokens
Related Lessons
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