Identify the error in this code snippet: const expr = set({ ':val': 5 }); const updateParams = { UpdateExpression: expr }; Options: A) UpdateExpression must be a string, not an object B) ':val' should be '#val' C) set() cannot accept objects D) No error, code is correct

medium📝 Debug Q6 of 15

DynamoDB - with AWS SDK

ANo error, code is correct

B':val' should be '#val'

Cset() cannot accept objects

DUpdateExpression must be a string, not an object

Step-by-Step Solution

Solution:

Step 1: Check set() return type
set() returns an expression object, not a string directly.
Step 2: Understand UpdateExpression requirement
UpdateExpression expects a string, so passing the object causes an error.
Final Answer:
UpdateExpression must be a string, not an object -> Option D
Quick Check:
UpdateExpression needs string = A [OK]

Quick Trick: Convert expression object to string before assigning UpdateExpression [OK]

Common Mistakes:

MISTAKES

Passing expression object directly without toString()
Confusing placeholders with attribute names
Assuming set() only accepts strings

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More DynamoDB Quizzes

Identify the error in this code snippet: const expr = set({ ':val': 5 }); const updateParams = { UpdateExpression: expr }; Options: A) UpdateExpression must be a string, not an object B) ':val' should be '#val' C) set() cannot accept objects D) No error, code is correct

Step 1: Check set() return type

Step 2: Understand UpdateExpression requirement

Final Answer:

Quick Check:

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