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Blockchain CBDE Exam - Topic 2 Question 72 Discussion

When you do external calls to other smart contracts:
B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

Blockchain CBDE Exam - Topic 2 Question 72 Discussion

Actual exam question for Blockchain's CBDE exam
Question #: 72
Topic #: 2
[All CBDE Questions]

When you do external calls to other smart contracts:

Show Suggested Answer Hide Answer
Suggested Answer: B

by Dominque at Jul 04, 2023, 02:02 AM

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Andrew
8 months ago
I thought we could skip checks in some cases, but A seems safer.
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Willard
8 months ago
A is the standard, can’t go wrong with that!
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Carole
9 months ago
Wait, is C even a real thing? Sounds off.
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Eugene
9 months ago
I disagree, B makes more sense to me.
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Melissa
9 months ago
Definitely A, checks-effects-interactions is key!
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Janae
9 months ago
I might be mixing things up, but I think the effects-checks-interactions pattern is the one that emphasizes avoiding state changes before the call.
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Elin
9 months ago
I feel like option C is kind of tricky. I thought the checks-effects-interactions pattern was always necessary for external calls, not just when direct calls aren't possible.
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Truman
10 months ago
I remember practicing a question similar to this, and I think it was about avoiding state changes after the call, which makes me lean towards option A.
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Quinn
10 months ago
I think we should definitely follow the checks-effects-interactions pattern, but I'm not sure if it applies to all external calls.
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Jacob
10 months ago
This is a good test of my cloud computing knowledge. I'll carefully review each option and try to match it back to the NIST definition I've studied.
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Willis
10 months ago
Hmm, I'm a bit confused. I'm not sure if CTI is about priority allocation or keeping an eye on the team. I'll need to think this through carefully.
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Hermila
10 months ago
Wait, I thought SMTP was just about the format of email messages, not the actual protocol for sending them. I'm going to have to review my notes on this before answering.
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Laurel
10 months ago
Okay, I think I've got this. dBm is the absolute power, dB is the relative power, and dBi is the relative gain. Let me double-check that.
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Martha
1 year ago
I'm just going to write 'All of the above' and hope the grader is in a good mood. Navigating these Solidity patterns is like trying to solve a Rubik's Cube blindfolded.
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Miriam
1 year ago
User 3: B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
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Enola
1 year ago
User 2: C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.
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Kimberlie
1 year ago
User 1: A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Tasia
1 year ago
Wait, so we have to do a dance before, during, and after the external call? This exam is turning into the Hokey Pokey!
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Dana
1 year ago
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.
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Latrice
1 year ago
B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
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Ahmed
1 year ago
Haha, it does sound like a dance routine, but it's just a way to ensure the safety and efficiency of your smart contract interactions.
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Elmer
1 year ago
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.
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Martha
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Callie
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Roslyn
1 year ago
I think Option C is the right answer. The checks-effects-interactions pattern is only necessary when you can't directly call the other contract. Otherwise, it's overkill.
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Gladys
1 year ago
B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
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Luann
1 year ago
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.
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Claudia
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Clorinda
1 year ago
I'm not sure about that 'effects-checks-interactions' thing. Isn't it better to just avoid state changes altogether when making external calls?
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Xochitl
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Margot
1 year ago
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.
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Hollis
1 year ago
B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
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Tarra
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Camellia
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Lashawn
1 year ago
C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.
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Derrick
1 year ago
B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.
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Margart
1 year ago
A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.
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Mitzie
1 year ago
But what about option C? It says it's necessary for calls to contracts where a direct contract call is not possible.
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Renea
1 year ago
I agree with Polly, it helps to avoid state changes after the call.
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Percy
1 year ago
Option A is definitely the way to go. Following the checks-effects-interactions pattern is crucial to avoid reentrancy vulnerabilities.
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Kaitlyn
1 year ago
User 2: I agree, following the checks-effects-interactions pattern is crucial to avoid reentrancy vulnerabilities.
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Devon
1 year ago
User 1: Option A is definitely the way to go.
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Polly
1 year ago
I think when doing external calls, we should follow the checks-effects-interactions pattern.
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Veta
1 year ago
I think both options have their merits, but I prefer following the checks-effects-interactions pattern, especially when direct contract calls are not possible.
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Dick
1 year ago
I disagree, I believe we should follow the effects-checks-interactions pattern and avoid state changes before the call.
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Tayna
1 year ago
I think when doing external calls, we should follow the checks-effects-interactions pattern and avoid state changes after the call.
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