Lambda function with DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the AWS SDK for DynamoDB in a Lambda function.

DynamoDB

const AWS = require('[1]');

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Aaws-sdk

Baws-sdk-client

Cdynamodb-sdk

Dlambda-sdk

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect package names like 'dynamodb-sdk' or 'lambda-sdk'.

Forgetting to import the AWS SDK before using DynamoDB.

The AWS SDK for JavaScript is imported using 'aws-sdk'. This allows access to DynamoDB and other AWS services.

2fill in blank

medium

Complete the code to create a DynamoDB DocumentClient instance in the Lambda function.

DynamoDB

const docClient = new AWS.[1]();

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ADynamoDBClient

BDocumentClient

CDynamoDB

DDynamoClient

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'DynamoDBClient' which is part of the newer AWS SDK v3, not v2.

Using 'DynamoDB' which is the low-level client, not the DocumentClient.

The DocumentClient simplifies working with DynamoDB by abstracting away low-level details. It is created with 'new AWS.DocumentClient()'.

3fill in blank

hard

Fix the error in the code to put an item into the DynamoDB table named 'Users'.

DynamoDB

const params = { TableName: 'Users', Item: [1] };
await docClient.put(params).promise();

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A'id: 123, name: Alice'

B[ id: 123, name: 'Alice' ]

C{ id: 123, name: 'Alice' }

Did=123, name='Alice'

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets [] which define arrays, not objects.

Passing a string instead of an object for Item.

The Item must be an object with key-value pairs. Using curly braces { } defines an object. Square brackets or strings are invalid here.

4fill in blank

hard

Fill both blanks to get an item from the 'Products' table where the 'productId' equals '123'.

DynamoDB

const params = { TableName: '[1]', Key: { [2]: '123' } };
const data = await docClient.get(params).promise();

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AProducts

BproductId

CUsers

Did

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong table name like 'Users'.

Using 'id' instead of 'productId' as the key attribute.

The TableName must be 'Products' and the Key attribute must be 'productId' to match the primary key of the table.

5fill in blank

hard

Fill all three blanks to update the 'status' attribute to 'active' for the item with 'userId' 'u123' in the 'Accounts' table.

DynamoDB

const params = {
  TableName: '[1]',
  Key: { [2]: 'u123' },
  UpdateExpression: 'set [3] = :s',
  ExpressionAttributeValues: { ':s': 'active' }
};
await docClient.update(params).promise();

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AAccounts

BuserId

Cstatus

DUsers

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong table name like 'Users'.

Using 'id' instead of 'userId' as the key.

Updating the wrong attribute name.

The TableName is 'Accounts', the Key attribute is 'userId', and the attribute to update is 'status'.