Checkpoint: Collections in Anger
Challenge on lesson: Checkpoint — The Collection Toolkit
CHALLENGE
Difficulty: intermediate+25 XP
Implement the four tools described in the checkpoint:
``csharp
static IReadOnlyDictionary<string, int> Frequency(string text);
static string? FirstUnique(string text);
static string ProcessOrders(IEnumerable<string> commands);
public sealed class EvictCache
{
public EvictCache(int capacity);
public void Put(string key, int value);
public int Get(string key);
}
``
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