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Why did Swift designers choose to disallow implicit fallthrough in switch statements?

hard📝 Conceptual Q10 of 15
Swift - Control Flow
Why did Swift designers choose to disallow implicit fallthrough in switch statements?
ATo reduce common bugs caused by unintended case execution
BBecause implicit fallthrough is slower in execution
CTo make switch statements compatible with C language
DBecause implicit fallthrough is deprecated in all modern languages
Step-by-Step Solution
Solution:

  1. Step 1: Identify design motivation

    Implicit fallthrough often causes bugs by running unintended cases.

  2. Step 2: Swift's safety-first approach

    Swift disallows implicit fallthrough to force explicit intent and reduce errors.

  3. Final Answer:

    To reduce common bugs caused by unintended case execution -> Option A

  4. Quick Check:

    Design choice = reduce bugs [OK]
Quick Trick: Swift disallows implicit fallthrough to avoid bugs [OK]
Common Mistakes:
  • Thinking implicit fallthrough is slower
  • Believing Swift aims for C compatibility
  • Assuming implicit fallthrough is deprecated everywhere

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