[Solved] Given this struct and JSON, what will be the value of userName after decoding? struct User:... Given this struct and JSON, what will be the value of userName after decoding? | iOS Swift

iOS Swift - Networking

Given this struct and JSON, what will be the value of userName after decoding?

struct User: Decodable {
  let userName: String
  enum CodingKeys: String, CodingKey {
    case userName = "user_name"
  }
}

JSON: {"user_name": "alice"}

ADecoding error

B"user_name"

Cnil

D"alice"

Step-by-Step Solution

Solution:

Step 1: Map JSON key to struct property
The custom key maps "user_name" in JSON to userName in Swift.
Step 2: Decode JSON value for userName
The JSON value "alice" is assigned to userName.
Final Answer:
"alice" -> Option D
Quick Check:
Custom key maps JSON value correctly [OK]

Quick Trick: Custom keys map JSON keys to Swift properties [OK]

Common Mistakes:

Expecting property name as value
Assuming decoding fails without exact key match
Confusing key names with values

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Given this struct and JSON, what will be the value of userName after decoding?

Step 1: Map JSON key to struct property

Step 2: Decode JSON value for userName

Final Answer:

Quick Check:

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