AWS - Serverless Architecture
You need to design a Step Functions workflow that processes a list of orders, but only for orders with amount greater than 100. Which combination of states is best to filter and process these orders?
You need to design a Step Functions workflow that processes a list of orders, but only for orders with amount greater than 100. Which combination of states is best to filter and process these orders?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Identify best pattern for conditional list processing
To process only qualifying items in a list, use Map to iterate over the list, with Choice inside the iterator to conditionally process or skip each order.Step 2: Evaluate options
Map with Choice inside the iterator processes only orders >100, skipping others via conditional logic. Choice before Map cannot transform or filter array inputs effectively as it controls workflow branching, not data. Pass and Wait states do not filter or process conditionally.Final Answer:
Use a Map state with a Choice state inside the iterator to process only orders with amount > 100 -> Option CQuick Check:
Map + Choice inside = conditional list processing [OK]
Quick Trick: Map + Choice in iterator for filtering/conditional process [OK]
Common Mistakes:
- Using Choice before Map to filter lists
- Using Pass or Wait states for filtering
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