Swift - Collections
You want to create an array that holds either integers or strings in Swift. Which approach correctly creates such an array?
You want to create an array that holds either integers or strings in Swift. Which approach correctly creates such an array?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Swift's type system for mixed arrays
Swift does not support union types like Int | String. To hold different types, use the type Any.Step 2: Check each option for correctness
let mixed: [Any] = [1, "two", 3] declares mixed as [Any] and initializes with Int and String values, which is valid. let mixed = [1, "two", 3] tries to infer type but fails due to mixed types. Options A and C use invalid syntax for union types.Final Answer:
let mixed: [Any] = [1, "two", 3] -> Option DQuick Check:
Mixed types array uses [Any] [OK]
Quick Trick: Use [Any] for arrays with mixed types [OK]
Common Mistakes:
- Trying to infer mixed types without [Any]
- Using invalid union type syntax
- Assuming Swift allows Int | String type
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