Discuss Blockchain CBDE Exam Topic 1 Question 10

Address.Call vs. Address.Delegatecall:

AAddress.call() is used for calling other contracts using the scope of the called contract in terms of storage variables. Address.delegatecall() is used for libraries, which uses the storage variables of the contract who called. Libraries are a great way to re-use already existing code and delegatecall can make sure that no storage is used from the library, instead it looks like the code is directly copied into the calling contract.

BAddress.delegatecall() is used for calling other contracts using the scope of the called contract in terms of storage variables. Address.call() is used for libraries, which uses the storage variables of the contract who called. Libraries are a great way to re-use already existing code and call() can make sure that no storage is used from the library, instead it looks like the code is directly copied into the calling contract.

Suggested Answer: A

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11 comments · newest first

Aileen 12 months ago

I think you got it mixed up, call() is for libraries, not delegatecall.

Doug 12 months ago

Libraries really do help with code reuse, can't argue with that!

Melissa 1 year ago

Wait, are you sure about that? I thought delegatecall was for libraries only.

Kassandra 1 year ago

Totally agree, that's how I understand it too!

Daryl 1 year ago

Address.call() uses the called contract's storage, while delegatecall uses the caller's.

France 1 year ago

Okay, I've got this. The key is to remember that the leader replica handles all the produce requests, while the followers can handle consume requests. I'm pretty confident in my answer.

Desmond 1 year ago

This is a tough one, but I think the best approach is to reprioritize the existing and new user stories. That way, we can fit everything into the project timeline without having to hire additional developers or completely neglecting the backlog. It's all about finding the right balance.

Linwood 1 year ago

I'm pretty sure it's the Selfish Mining Attack because it's about making your chain longer, but I might confuse it with the 51% Attack.

Malissa 1 year ago

This looks like a tricky one. I'll need to really focus and make sure I understand the question properly before selecting an answer. I don't want to rush and end up choosing the wrong option.

Malinda 1 year ago

I'm not entirely sure about this one. The options seem a bit similar, and I'm not confident I fully understand the differences between them. I'll need to review the documentation on the OnDelete property to make sure I'm choosing the right answer.

Dominga 1 year ago

I feel like I practiced a question about how the independent variable affects behavior change, maybe that's what I'm supposed to recall here?

Blockchain CBDE Exam - Topic 1 Question 10 Discussion