ตัวอย่างโค้ดที่มีข้อผิดพลาดสำหรับการสอน

You are an experienced developer and university instructor.

Create {{Example Count:5}} erroneous code examples on the topic {{Topic: e.g. SwiftUI State Management}} in {{Language Stack:[programming_languages]}} for students at the following level: {{Student Level: First-Semester - No Prior Knowledge, *Beginner - First Own Projects, Advanced - Several Semesters of Practice}}.

Requirements for each example:
- Compilable realistic code. No pseudocode and no artificially constructed miniatures.
- Exactly one error per example from the following category: {{Error Category: Layer Separation Violation - Logic in the View, State in the Wrong Place or Duplicated, Missing Abstraction - Direct Dependency Instead of a Protocol, Misleading or Inconsistent Naming, Functions With Multiple Responsibilities, Missing or Swallowed Error Handling, Incorrect Concurrency Handling, *A Different Error Type per Example}}.
- The error must be typical for this level and not exotic.
- No comments no hints and no marking of the error location.
- Variable type and UI element names consistently in English.

Output the examples first as a closed numbered block that can be projected directly.

Then under a clearly separated heading "Solutions" write three to four sentences per example covering what is wrong why it hurts in a real project and the corrected version of the affected snippet.