Blockchain Exam CBDE Topic 1 Question 99 Discussion

Actual exam question for Blockchain's CBDE exam

Question #: 99
Topic #: 1

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.

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Suggested Answer: A

by Eun at Sep 14, 2024, 08:29 AM

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Micah

2 months ago

I think the real question is, why do we even need all these different call functions? Can't we just have one that does everything? *sigh* Solidity, you so complicated.

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Filiberto

11 days ago

Yeah, Solidity definitely has its complexities. But once you understand the reasons behind these different call functions, it becomes easier to work with them.

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William

12 days ago

I know, it can get confusing with all these different functions. But each one has its own specific use case to make the code more efficient and secure.

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Rachael

14 days ago

B) Address.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.

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Argelia

1 months ago

A) Address.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.

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Remona

2 months ago

This question is as clear as mud! I'm just going to guess and say B. Maybe I'll get lucky and the answer will be something completely different.

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Lindsey

2 months ago

Hmm, this is a tricky one. I'm going to go with A, but I'm not 100% sure. I need to review my notes on these Solidity functions again.

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Tamesha

21 days ago

User1: Let's review our notes just to be sure.

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Val

26 days ago

User2: I agree, A seems to be the right choice.

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Harrison

28 days ago

User1: I think A is the correct option.

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Kerry

1 months ago

User 3: I agree, A is the way to go. Delegatecall is for libraries.

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Brittani

1 months ago

Yeah, A sounds right. It's all about the scope of storage variables.

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Corrie

1 months ago

I think A is the correct option.

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Steffanie

2 months ago

So, Address.call() is more for calling other contracts with their own storage?

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Julene

2 months ago

Yes, that's correct. It allows the library code to be executed in the context of the calling contract.

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Lewis

2 months ago

B sounds more accurate to me. From what I know, delegatecall is used to call other contracts and maintain the calling contract's storage, while call is used for libraries.

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