Swift - Loops
Which of the following correctly creates a stride in Swift that counts down from 10 to 0 by 2?
Which of the following correctly creates a stride in Swift that counts down from 10 to 0 by 2?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct parameters for descending stride
To count down from 10 to 0 by 2, start is 10, step is -2, and end is 0. Usingthroughincludes 0 if reached.Step 2: Check each option
stride(from: 10, through: 0, by: -2) usesstride(from: 10, through: 0, by: -2), which correctly counts 10, 8, 6, 4, 2, 0. stride(from: 10, to: 0, by: -2) usesto: 0which excludes 0. Options B and C start at 0, which is incorrect.Final Answer:
stride(from: 10, through: 0, by: -2) correctly counts down including 0 -> Option BQuick Check:
Descending stride with 'through' includes end = D [OK]
Quick Trick: Use negative step and 'through' to include end in descending stride [OK]
Common Mistakes:
- Using 'to' instead of 'through' and missing the end value
- Using positive step for descending sequence
- Swapping start and end values
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