[Solved] Identify the error in this Swift network call code: URLSession.shared.dataTask(with: url) { data, response, error in if error != nil { print(error.localizedDescription) } }.resume() | iOS Swift

iOS Swift - Networking

Identify the error in this Swift network call code:

URLSession.shared.dataTask(with: url) { data, response, error in
  if error != nil {
    print(error.localizedDescription)
  }
}.resume()

Aresume() is missing to start the task

Bdata parameter is not checked for nil

Cerror is optional and must be unwrapped before use

DURLSession.shared is incorrect usage

Step-by-Step Solution

Solution:

Step 1: Check error usage
error is an optional; accessing localizedDescription without unwrapping causes compile error.
Step 2: Confirm resume() and other parts
resume() is present; data check is optional; URLSession.shared is correct.
Final Answer:
error is optional and must be unwrapped before use -> Option C
Quick Check:
Optional error must be unwrapped = error is optional and must be unwrapped before use [OK]

Quick Trick: Always unwrap optional error before accessing properties [OK]

Common Mistakes:

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