Why is it important to provide a unique id when creating a List from an array of non-Identifiable items?

hard📝 Conceptual Q10 of 15

iOS Swift - SwiftUI Layout

Why is it important to provide a unique id when creating a List from an array of non-Identifiable items?

ATo change the font of each row

BTo make the list scrollable

CTo help SwiftUI track and update each row efficiently

DTo enable user interaction on rows

Step-by-Step Solution

Solution:

Step 1: Understand List's need for unique identifiers
SwiftUI uses the id to know which row corresponds to which data item for updates and animations.
Step 2: Eliminate unrelated options
Scrolling, font, and interaction are unrelated to id usage.
Final Answer:
To help SwiftUI track and update each row efficiently -> Option C
Quick Check:
Unique id enables efficient List updates [OK]

Quick Trick: Unique id lets SwiftUI track rows efficiently [OK]

Common Mistakes:

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