10000 Reworked case class tutorial #547 by jatcwang · Pull Request #599 · scala/docs.scala-lang · GitHub
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Merged
merged 7 commits into from
Oct 18, 2016
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Reworked case class tutorial #547 #599

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94fad22
Reworked case class tutorial #547
jatcwang Oct 9, 2016
2dfa9c4
Put tut:fail for code block that should fail to compile
jatcwang Oct 10, 2016
6230bc9
Remove mentions of generated code + reworded last paragraph
jatcwang Oct 13, 2016
87582d4
remove mentions of generated code
jatcwang Oct 13, 2016
4c647e5
reword last bullet point
jatcwang Oct 13, 2016
bc8cf17
lower case "Pattern Matching" and "Case Classes" since they're not pr…
jatcwang Oct 14, 2016
aee907b
comments about using 'vars' in case class fields.
jatcwang Oct 14, 2016
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Put tut:fail for code block that should fail to compile
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jatcwang committed Oct 10, 2016
commit 2dfa9c46d85919df3951c3c86c6ff86463426230
9 changes: 6 additions & 3 deletions tutorials/tour/case-classes.md
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Expand Up @@ -41,12 +41,15 @@ val title = emailFromJohn.title
println(title) // prints "Greetings From John!"
```

With case classes, you cannot mutate their fields directly. Instead, you make a copy using the `copy` method.
As seen below, you can replace just some of the fields:
With case classes, you cannot mutate their fields directly.

```tut
```tut:fail
emailFromJohn.title = "Goodbye From John!" // This is a compilation error. We cannot assign another value to val fields, which all case classes fields are by default.
```

Instead, you make a copy using the `copy` method. As seen below, you can replace just some of the fields:

```tut
val editedEmail = emailFromJohn.copy(title = "I am learning Scala!", body = "It's so cool!")

println(emailFromJohn) // prints "Email(john.doe@mail.com,Greetings From John!,Hello World!)"
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