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📜 WAYPOINT LESSON

Checkpoint — Generics

⭐ beginner⏳ 20 min read📍 Lesson 49 of 85

A typed in-memory repository: add, get, remove, and a constraint-driven query — one class, every type.

Checkpoint: the generic repository

Task: implement nested generic class Solution.Repository<T> where T : IComparable<T>:

  1. void Add(T item) — appends.
  2. int Count { get; }
  3. T Get(int index) — ArgumentOutOfRangeException when out of range.
  4. bool Remove(T item) — removes the first equal element; returns false when absent.
  5. T? Min() — the smallest element; InvalidOperationException when empty.
  6. List<T> Sorted() — a NEW list sorted ascending; the store's own order must not change.