Swift - Collections
Which of the following creates an empty array of Integers in Swift?
Which of the following creates an empty array of Integers in Swift?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Understand empty array creation
An empty array must have its type specified if no elements are given.Step 2: Check each option
let numbers: [Int] = [] explicitly declares an empty array of Int type. let numbers = Int[] is invalid because Swift array type syntax is [Int], not Int[]. let numbers = [] is invalid because type cannot be inferred from empty brackets. let numbers = [0] creates an array with one element, 0.Final Answer:
let numbers: [Int] = [] -> Option CQuick Check:
Empty array with type annotation = let numbers: [Int] = [] [OK]
Quick Trick: Empty arrays need explicit type or initializer [OK]
Common Mistakes:
- Using [] without type annotation
- Confusing empty array with array containing zero
- Using incorrect syntax like let numbers = []
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