Batch operations in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a batch of transactions using the correct method.

Blockchain / Solidity

const batch = new web3.[1]();

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ABatchOperations

BBatchRequest

CBatchTransactions

DTransactionBatch

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent class like TransactionBatch.

Confusing batch operations with single transactions.

The BatchRequest class is used to create a batch of requests in web3.js.

2fill in blank

medium

Complete the code to add a transaction call to the batch.

Blockchain / Solidity

batch.[1](contract.methods.transfer(toAddress, amount), callback);

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Aadd

Bsend

Cqueue

Dpush

Attempts:

3 left

💡 Hint

Common Mistakes

Using send which executes immediately instead of adding to batch.

Using push which is not a method of batch.

The add method is used to add a request to the batch.

3fill in blank

hard

Fix the error in the code to execute the batch of transactions.

Blockchain / Solidity

batch.[1]();

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Arun

Bprocess

Csend

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using send which is for single transactions.

Using run or process which do not exist.

The execute method runs all requests in the batch.

4fill in blank

hard

Fill both blanks to create a batch and add a call to get the balance.

Blockchain / Solidity

const batch = new web3.[1]();
batch.[2](contract.methods.balanceOf(userAddress), callback);

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ABatchRequest

Bsend

Cadd

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of add to add calls.

Confusing batch creation with execution.

First, create a BatchRequest object, then add the balanceOf call to the batch.

5fill in blank

hard

Fill all three blanks to create a batch, add two calls, and execute the batch.

Blockchain / Solidity

const batch = new web3.[1]();
batch.[2](contract.methods.approve(spender, amount), callback);
batch.[3](contract.methods.allowance(owner, spender), callback);
batch.execute();

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ABatchRequest

Badd

Csend

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of add to add calls.

Trying to execute the batch before adding calls.

Create a BatchRequest, then add each call to the batch before executing.