Errata

The text in the last paragraph before the "there are no Dumb Questions" section does not match what is being discussed directly above and the code snippet uses as an example. As there is no "ScoreText.text" within the snippet or an attempt to assign 'x' to it.

This can be found in Chapter 4 page 205 of the .pdf file. It is the same in my Kindle eBook version on page 520 (page may differ slightly based on font size on Kindle).

I would copy and paste the exact text involved, but there is an image (Error Exception message) within the text that interferes.

Note from the Author or Editor:
Thanks for catching this – looks like this was a (ScoreText.text is from a Unity lab later in the book). This paragraph should be updated to read:

text is a string variable, so when you used the + operator to concatenate a string it converted the value to a string and the assignment worked. But when you try to assign the number value to it directly, it doesn’t have a way to automatically convert the long value to a string. You can convert a numeric value (or any other value!) to a string by calling its ToString method.

There is no “Margin” property in the Properties window. Had to type Margin="0,0,0,20" into the tag by hand.

Note from the Author or Editor:
Add a warning to the top of the page formatted similar to the on at the top of page 30 (you can remove the line break between the first two paragraphs to make room):

An update to Visual Studio since we took that screenshot may have removed Margin from the Properties window. If you don't see it (or any other property), just type the XAML so it matches.

Add the a caption box (one of those boxes with rounded corners) to the bottom of the page with the following text – you can move the "Sharpen your pencil solution" box up to make room:

Do you see a warning in the Error List window about a non-nullable field? Your code will still run even when you see green warnings (unlike errors red errors, which mean your code can't run). But you should still pay attention to warnings! Don't worry about this warning for now—you'll learn about what it is and how to fix it in Chapter 11.

The keyword "static" is unnecessary and should be removed.

Note from the Author or Editor:
Remove the word "static" from these lines:

static void TryAnIf()

static void TryAnIfElse()

static void TrySomeLoops()

This needs checking but the question at the top of the page:

'Remember the sealed modifier from Chapter 7? It’s how you set up a class that can’t be extended.'

Refers to the sealed modifier from chapter 7, but I don't think the sealed modifier had been mentioned by that point. I may be mistaken though.

Note from the Author or Editor:
This is correct. Make the following changes.

Page 699:

Remove the annotation "Structs can implement interfaces but can't subclass other classes. And structs are sealed so they can't be extended."

Replace it with a caption box (one of those boxes with rounded corners) with the following text:

Structs can implement interfaces but can't subclass other classes. And structs are sealed so they can't be extended. You can make any class sealed by adding the sealed access modifier to it.

Add Access modifiers, sealed to the index


Page 723:
Change this annotation: "Remember the sealed modifier from chapter 7? It's how you set up a class that can't be extended."

To this: "We talked about earlier in the chapter about how structs are sealed, and how you can use the sealed access modifier to make a class that can't be extended."