Swift - Collections
What is the type of the array created by
let numbers = [1, 2.5, 3] in Swift?What is the type of the array created by let numbers = [1, 2.5, 3] in Swift?
medium📝 Predict Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze the array elements' types
The array contains 1 (Int), 2.5 (Double), and 3 (Int). Swift will promote Int values to Double to keep the array type consistent.Step 2: Determine the inferred array type
Because of the Double value 2.5, Swift infers the array type as [Double], converting Ints to Double.Final Answer:
[Double] -> Option BQuick Check:
Mixed Int and Double = [Double] [OK]
Quick Trick: Mixed Int and Double become [Double] array [OK]
Common Mistakes:
- Assuming array is [Int]
- Expecting a syntax error for mixed types
- Thinking array becomes [Float]
Master "Collections" in Swift
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Swift Quizzes