AWS Step Functions Tutorial | Lambda Map State Example (Square Numbers in Parallel)
Learn how to build a simple AWS Step Functions workflow step-by-step! In this hands-on tutorial, we’ll create two Lambda functions — one to square numbers in parallel using a Map state, and another to aggregate the results into a final output.
You’ll learn:
✅ How to create Lambda functions in AWS
✅ How to use Step Functions with a Map state for parallel execution
✅ How to aggregate results from multiple Lambda invocations
✅ Tips for controlling concurrency and avoiding overload
What we build:
Input: a list of numbers
Step Functions Map state runs a Lambda function to square each number (in parallel!)
An aggregator Lambda combines the results into a single output
Perfect for AWS beginners who want to understand Step Functions, Lambda integration, and parallel processing in AWS.
🔧 Example Input:
{
"numbers": [
{"number": 2},
{"number": 3},
{"number": 5}
]
}
📌 Resources Used in This Video:
AWS Lambda
AWS Step Functions
Map State (Parallel Execution)
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