[Solved] What will be the output of this Step Functions state machine if the input is {"numbers":... What will be the output of this Step Functions state machine if the input is {"numbers": [1,2,3]}? | AWS

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What will be the output of this Step Functions state machine if the input is {"numbers": [1,2,3]}? It uses a Map state to multiply each number by 2.

{
  "StartAt": "MultiplyMap",
  "States": {
    "MultiplyMap": {
      "Type": "Map",
      "ItemsPath": "$.numbers",
      "Iterator": {
        "StartAt": "Multiply",
        "States": {
          "Multiply": {
            "Type": "Task",
            "Resource": "arn:aws:lambda:region:account:function:multiplyByTwo",
            "End": true
          }
        }
      },
      "End": true
    }
  }
}

AThe output is [1, 2, 3]

BThe output is [2, 4, 6]

CThe output is an error due to missing Next field

DThe output is [3, 6, 9]

Step-by-Step Solution

Solution:

Step 1: Understand Map state behavior
The Map state runs the iterator for each item in the input array, here multiplying each number by two.
Step 2: Apply the Lambda function to each item
Input numbers [1,2,3] each get multiplied by 2, resulting in [2,4,6].
Final Answer:
The output is [2, 4, 6] -> Option B
Quick Check:
Map state output = doubled array [OK]

Quick Trick: Map runs iterator on each item, transforming the list [OK]

Common Mistakes:

Confusing input and output arrays
Expecting errors from missing Next in iterator end states

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What will be the output of this Step Functions state machine if the input is {"numbers": [1,2,3]}? It uses a Map state to multiply each number by 2.

Step 1: Understand Map state behavior

Step 2: Apply the Lambda function to each item

Final Answer:

Quick Check:

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