Swift Persistence (To-Do)

In-memory CRUD that mirrors Core Data ideas (entities, identity, queries) with a clean controller layer. Runs anywhere (even online Swift runners).

What’s here

• Models.swift — TodoItem entity + display helpers
• TodoStore.swift — store protocol + in-memory store
• TodoController.swift — business logic (add, toggle, list)
• main.swift — small demo that prints the list

Run (web)

Use an online Swift runner. Paste all four files into one editor pane in this order:

1. Models.swift
2. TodoStore.swift
3. TodoController.swift
4. main.swift
   Then click Run and copy your output below.

Sample Output

All:
[x] Buy groceries
[ ] Study Swift