Chapter 2: C# records, init, and immutable collections

In this chapter

2.1　record class: the book’s main tool for immutable reference types
- Two declaration styles
- Value equality: the key difference between records and classes
2.2　Init-only properties and required
2.3　With expressions: creating modified versions
- Nested updates
2.4　The shallow immutability trap
- Switching to IReadOnlyList<T>
2.5　Choosing immutable collections
- The ImmutableArray<T> default trap
- Collection fields and value equality
- FrozenDictionary: build once, query many times
2.6　Record structs and readonly record structs
- When to use a record struct
- Record structs are mutable by default
- Avoid mutable structs
2.7　Chapter review

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