'case' removed when possible from Initialization #bruce #time 10m

Chapters/04_Initialization.md

@@ -54,18 +54,14 @@ The simplest approach is to buy `Bread` from the store:
 import zio.*
 import zio.direct.*
 
-case class BreadStoreBought() extends Bread
+class BreadStoreBought extends Bread
 
 object BreadStoreBought:
   val purchased =
     ZLayer.succeed:
       BreadStoreBought()
 ```
 
-In this book, we follow the Scala practice of preferring `case` classes over ordinary classes.{i: "case class"}{i: "class, case"}
-`case` classes are immutable by default and automatically provide commonly-needed functionality.
-You aren't required to use `case` classes to work with the Effect system, but they provide valuable conveniences.
-
 The companion object `BreadStoreBought` contains a single value called `purchased`.
 This produces a special kind of Effect: the `ZLayer`.{i: "ZLayer"}
 The Effect System uses `ZLayer`s to automatically inject dependencies.
@@ -148,7 +144,7 @@ import zio.*
 import zio.Console.*
 import zio.direct.*
 
-case class X():
+class X:
   val display = printLine("X.display")
 
 val makeX =
@@ -201,7 +197,7 @@ The `ZLayer` is the holder for the object produced by `make`, and it provides a
 Adding trace information to the previous example reveals the steps of program initialization:{i: "initialization, steps"}
 
 ```scala 3 mdoc:silent
-case class Y():
+class Y:
   val display = printLine("Y.display")
 
 val makeY =
@@ -271,7 +267,7 @@ import zio.*
 import zio.direct.*
 import zio.Console.*
 
-case class Dough():
+class Dough:
   val letRise = printLine("Dough: rising")
 ```
 
@@ -311,7 +307,7 @@ import zio.direct.*
 import zio.Console.*
 
 trait HeatSource
-case class Oven() extends HeatSource
+class Oven extends HeatSource
 
 object Oven:
   val heated =
@@ -330,7 +326,7 @@ import zio.*
 import zio.direct.*
 import zio.Console.*
 
-case class BreadHomeMade(
+class BreadHomeMade(
     heat: HeatSource,
     dough: Dough,
 ) extends Bread
@@ -414,7 +410,7 @@ A `Toaster` is a `HeatSource`:
 import zio.*
 import zio.direct.*
 
-case class Toaster() extends HeatSource
+class Toaster extends HeatSource
 
 object Toaster:
   val ready =
@@ -560,7 +556,7 @@ import zio.*
 import zio.direct.*
 import zio.Console.*
 
-case class BreadFromFriend() extends Bread()
+class BreadFromFriend extends Bread()
 
 object Friend:
   def forcedFailure(invocations: Int) =

graveyard/CaseClassExplanation.md

@@ -0,0 +1,4 @@
+In this book, we follow the Scala practice of preferring `case` classes over ordinary classes.{i: "case class"}{i: "class, case"}
+`case` classes are immutable by default and automatically provide commonly needed functionality.
+You aren't required to use `case` classes to work with the Effect system, but they provide valuable conveniences.
+