Bird
0
0

You want to safely remove all even numbers from an array while looping. Which approach respects Swift's loop safety?

hard📝 Application Q8 of 15
Swift - Loops
You want to safely remove all even numbers from an array while looping. Which approach respects Swift's loop safety?
AModify the array inside a while loop without checks
BRemove even numbers directly inside a for-in loop over the array
CUse a for-in loop and remove elements by index during iteration
DCreate a new array filtering out even numbers, then assign it back
Step-by-Step Solution
Solution:

  1. Step 1: Understand safe mutation

    Modifying a collection during iteration is unsafe in Swift.

  2. Step 2: Use filtering to create a new array

    Filtering creates a new array without modifying the original during iteration.

  3. Final Answer:

    Create a new array filtering out even numbers, then assign it back -> Option D

  4. Quick Check:

    Safe removal = Use filtered copy [OK]
Quick Trick: Filter to remove items safely, don't mutate in loop [OK]
Common Mistakes:
  • Removing items inside for-in loop
  • Modifying array by index during iteration
  • Ignoring Swift's safety rules

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Swift Quizzes
Collections - Array iteration and enumerated - Quiz 4medium Collections - Array iteration and enumerated - Quiz 14medium Control Flow - Switch must be exhaustive - Quiz 15hard Data Types - Type conversion is always explicit - Quiz 7medium Functions - Why functions are first-class in Swift - Quiz 11easy Operators and Expressions - Operator overloading concept - Quiz 3easy Swift Basics and Runtime - Comments and documentation markup - Quiz 13medium Swift Basics and Runtime - Swift REPL and Playgrounds - Quiz 12easy Swift Basics and Runtime - Swift REPL and Playgrounds - Quiz 7medium Variables and Constants - Type inference by the compiler - Quiz 1easy