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Added issue for page 244

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Mark J Price 2023-10-22 18:55:28 +01:00
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docs/errata/README.md
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@ -2,7 +2,7 @@
If you find any mistakes in the seventh edition, *C# 11 and .NET 7 - Modern Cross-Platform Development Fundamentals*, or if you have suggestions for improvements, then please [raise an issue in this repository](https://github.com/markjprice/cs11dotnet7/issues) or email me at markjprice (at) gmail.com.
[**Errata** (47 items)](errata.md): Typos, tool user interface changes, or mistakes in code that would cause a compilation error that prevents a successful build.
[**Errata** (48 items)](errata.md): Typos, tool user interface changes, or mistakes in code that would cause a compilation error that prevents a successful build.
[**Improvements** (44 items)](improvements.md): Changes to text or code that would improve the content. These are optional.

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docs/errata/errata.md
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@ -26,6 +26,7 @@ If you find any mistakes, then please [raise an issue in this repository](https:
- [Page 188 - Running unit tests using Visual Studio Code](#page-188---running-unit-tests-using-visual-studio-code)
- [Page 231 - Requiring properties to be set during instantiation](#page-231---requiring-properties-to-be-set-during-instantiation)
- [Page 235 - More about methods](#page-235---more-about-methods)
- [Page 244 - Enhancements to pattern matching in C# 9 or later](#page-244---enhancements-to-pattern-matching-in-c-9-or-later)
- [Page 244 - Init-only properties](#page-244---init-only-properties)
- [Page 256 - Defining and handling delegates](#page-256---defining-and-handling-delegates)
- [Page 258 - Defining and handling events](#page-258---defining-and-handling-events)
@ -382,6 +383,25 @@ In this section, we define some methods and operators so that two `Person` objec
cgwid suggested a solution in [the issue they raised](https://github.com/markjprice/cs11dotnet7/issues/59). I want to rethink this code example for the next edition to avoid it becoming overly complex so I will leave it to the reader to decide how they might want to solve it. Meanwhile, I have added an improvement with suggested alternative code here: https://github.com/markjprice/cs11dotnet7/blob/main/docs/errata/improvements.md#page-235---more-about-methods
# Page 244 - Enhancements to pattern matching in C# 9 or later
> Thanks to [Noel Arzola Jr](https://github.com/NoelArzola) for raising this [issue on 22 October 2023](https://github.com/markjprice/cs11dotnet7/issues/87).
At the end of this section, I wrote, "You could also use the relational pattern in combination with the property pattern to avoid the nested
switch expression, as shown in the following code:"
```cs
FirstClassPassenger { AirMiles: > 35000 } => 1500,
FirstClassPassenger { AirMiles: > 15000 } => 1750M,
FirstClassPassenger => 2000M,"
```
The `1500` return value is missing the decimal suffix `M`. The code should be:
```cs
FirstClassPassenger { AirMiles: > 35000 } => 1500M,
FirstClassPassenger { AirMiles: > 15000 } => 1750M,
FirstClassPassenger => 2000M,"
```
# Page 244 - Init-only properties
> Thanks to Bob Molloy for raising this issue via email.