What are mutable collection types in C#?

What are mutable collection types in C#?

Mutable collection types in C# are collections that can be modified after they are created, such as List<T> and Dictionary<TKey, TValue>.

Can you give me an example of using a List in C#?

Sure! Here's a simple example:

List<int> numbers = new List<int>();
numbers.Add(1);
numbers.Add(2);
numbers.Add(3);
numbers.Remove(2);

This creates a list of integers, adds three numbers, and removes one.

What about Dictionary? How does it work?

A Dictionary in C# is a collection of key-value pairs. Here's an example:

Dictionary<string, int> ages = new Dictionary<string, int>();
ages.Add("Alice", 30);
ages.Add("Bob", 25);
int aliceAge = ages["Alice"];

This creates a dictionary where you can look up ages by name.

Are there any performance considerations with mutable collections?

Yes, mutable collections can have performance implications, especially with resizing operations in lists or hash collisions in dictionaries. It's important to choose the right collection type based on your use case.