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Which syntax correctly represents a node connection with a condition in LangGraph?

easy📝 Syntax Q12 of 15
LangChain - LangGraph for Stateful Agents
Which syntax correctly represents a node connection with a condition in LangGraph?
A<code>connect(node1, node2, condition: x > 5)</code>
B<code>node1.connect(node2, condition=lambda x: x > 5)</code>
C<code>node1 -> node2 if x > 5</code>
D<code>node1.connect(node2, condition=x > 5)</code>
Step-by-Step Solution
Solution:

  1. Step 1: Identify correct method call syntax

    LangGraph uses method calls like node1.connect(node2, condition=...) with a lambda for conditions.

  2. Step 2: Check condition format

    The condition must be a callable (like a lambda), not a direct expression or keyword syntax.

  3. Final Answer:

    <code>node1.connect(node2, condition=lambda x: x > 5)</code> -> Option B

  4. Quick Check:

    Use method with lambda condition [OK]
Quick Trick: Conditions use lambda functions inside connect() [OK]
Common Mistakes:
MISTAKES
  • Using arrow syntax instead of method calls
  • Passing condition as a direct expression, not lambda
  • Using invalid keywords in connect()

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