[Solved] What is wrong with this code? const expr = set({ ':val': 10 }).toString(); const params = { TableName: 'MyTable', Key: { id: '123' }, UpdateExpression: expr, ExpressionAttributeValues: { ':val':... | DynamoDB

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What is wrong with this code? const expr = set({ ':val': 10 }).toString(); const params = { TableName: 'MyTable', Key: { id: '123' }, UpdateExpression: expr, ExpressionAttributeValues: { ':val': 10 } }; Options: A) ExpressionAttributeValues keys must match placeholders in UpdateExpression B) No error, code is correct C) UpdateExpression should not be a string D) Key should be a string, not an object

AExpressionAttributeValues keys must match placeholders in UpdateExpression

BNo error, code is correct

CUpdateExpression should not be a string

DKey should be a string, not an object

Step-by-Step Solution

Solution:

Step 1: Verify placeholder matching
UpdateExpression uses ':val' and ExpressionAttributeValues provides ':val' key, so they match.
Step 2: Check Key and UpdateExpression types
Key is an object with partition key, and UpdateExpression is a string, both correct.
Final Answer:
No error, code is correct -> Option B
Quick Check:
Matching placeholders and correct types = B [OK]

Quick Trick: Ensure placeholders in expression match keys in ExpressionAttributeValues [OK]

Common Mistakes:

MISTAKES

Mismatching placeholder names
Passing Key as string instead of object
Thinking UpdateExpression must be object

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What is wrong with this code?

Step 1: Verify placeholder matching

Step 2: Check Key and UpdateExpression types

Final Answer:

Quick Check:

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