[Solved] This Swift code attempts to handle a network error but has a logic error: URLSession.shared.dataTask(with: url) { data, response, error in if error == nil { print("No error") } else { print(error!.... | iOS Swift

iOS Swift - Networking

This Swift code attempts to handle a network error but has a logic error:

URLSession.shared.dataTask(with: url) { data, response, error in
  if error == nil {
    print("No error")
  } else {
    print(error!.localizedDescription)
  }
}.resume()

What is the likely cause of the logic error?

ANot calling resume() on the data task

BForce unwrapping error when it is nil

CUsing error == nil instead of error != nil

DPrinting error.localizedDescription without checking error

Step-by-Step Solution

Solution:

Step 1: Analyze the logic and best practice
The code checks if error == nil for success first, then handles error in else (safe unwrap). While functional, best practice is to check if error != nil first to explicitly handle failures before success.
Final Answer:
Using error == nil instead of error != nil -> Option C
Quick Check:
Error check logic reversed [OK]

Quick Trick: Check error != nil to handle errors safely [OK]

Common Mistakes:

Reversing error check logic
Force unwrapping error without check
Not calling resume() on data task

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This Swift code attempts to handle a network error but has a logic error:

Step 1: Analyze the logic and best practice

Final Answer:

Quick Check:

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