[Solved] Given this Lambda event handler code snippet triggered by DynamoDB Streams:def lambda_handler(event, context): for record in event['Records']: if record['eventName'] == 'INSERT':... | AWS

AWS - Serverless Architecture

Given this Lambda event handler code snippet triggered by DynamoDB Streams:

def lambda_handler(event, context):
    for record in event['Records']:
        if record['eventName'] == 'INSERT':
            print(record['dynamodb']['NewImage']['id']['S'])

What will this code print when a new item with id '123' is added to the DynamoDB table?

A'123' printed once for the new item

B'id' key printed instead of its value

CAn error because 'NewImage' does not exist

DNothing, because eventName is not 'INSERT'

Step-by-Step Solution

Solution:

Step 1: Understand event structure for INSERT
For an INSERT event, 'NewImage' contains the new item data including 'id'.
Step 2: Analyze code behavior
The code prints the string value of 'id' from 'NewImage' when eventName is 'INSERT'.
Final Answer:
'123' printed once for the new item -> Option A
Quick Check:
INSERT event prints new id value = D [OK]

Quick Trick: INSERT events have NewImage with new item data [OK]

Common Mistakes:

Assuming eventName is different
Expecting OldImage on INSERT
Confusing key name with value

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Given this Lambda event handler code snippet triggered by DynamoDB Streams:

Step 1: Understand event structure for INSERT

Step 2: Analyze code behavior

Final Answer:

Quick Check:

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