1Z0-1127-25 LangChain and AI Application Development Practice Question
A developer wants to compose a LangChain pipeline using the LCEL (LangChain Expression Language) to combine a prompt template, a model, and an output parser. Which operator is used for this composition?
⚠ Common exam trap
OCI often tests the LCEL pipe operator by presenting operators from other programming paradigms (like `>>` for bit shifting or `->` for arrow functions) to confuse candidates who are not familiar with LangChain's specific syntax.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
| (pipe) operator
In LangChain Expression Language (LCEL), the pipe operator `|` is used to compose components like prompt templates, models, and output parsers into a single chain. This operator passes the output of one component as the input to the next, enabling a clean, declarative pipeline syntax.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
>> (right shift) operator
Why it's wrong here
>> is not used in LCEL.
- ✗
-> (arrow) operator
Why it's wrong here
-> is not an operator in LCEL.
- ✓
| (pipe) operator
Why this is correct
LCEL uses the | operator to compose chains.
- ✗
+ (plus) operator
Why it's wrong here
The + operator is not used for chaining in LCEL.
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