cvogt · February 22, 2017 13:51 · Feb 22, 2017 · Feb 22, 2017 · Feb 22, 2017 · Feb 22, 2017
diff --git a/defaults-and-copy-ideas.scala b/defaults-and-copy-ideas.scala
@@ -12,7 +12,7 @@ case class Baz(bar: Bar)
 val b = Baz( Bar( "world" ) )
 assert(
   b.copy( bar = b.bar.copy( str = "hello, " ++ b.bar.str ) ) // old: having to repeat repeat b and b.bar
-  == b.copy( bar ~= _.copy( str ~= "hello, " ++ _ ) ) // new: short version via ~= operator for modification
+  == b.copy( bar _= _.copy( str _= "hello, " ++ _ ) ) // new: short version via ~= operator for modification (alt syntax ~=)
 )
 // new short version desugars to this (using access to default values):
 b.copy( bar = b.copy.bar.copy( str = "hello, " ++ b.copy.bar.copy.str ) )
@@ -22,6 +22,6 @@ b.copy( bar = b.copy.bar.copy( str = "hello, " ++ b.copy.bar.copy.str ) )
 class Foo{ def str = "world" }
 assert(
   new Foo{ override str = "hello, " ++ super.str }.str // having to repeat `str` in override
-  == new Foo{ override str ~= "hello, " ++ _ }.str // new: modifying function based on parent value
+  == new Foo{ override str _= "hello, " ++ _ }.str // new: modifying function based on parent value (alt syntax ~=)
 )
 
diff --git a/defaults-and-copy-ideas.scala b/defaults-and-copy-ideas.scala
@@ -11,7 +11,7 @@ assert( Bar.apply.str == "test" ) // same for case classes via .apply method
 case class Baz(bar: Bar)
 val b = Baz( Bar( "world" ) )
 assert(
-  b.copy( bar = b.bar.copy( str = "hello, " ++ b.bar.str ) ) // old: having to repeat repeat b.bar
+  b.copy( bar = b.bar.copy( str = "hello, " ++ b.bar.str ) ) // old: having to repeat repeat b and b.bar
   == b.copy( bar ~= _.copy( str ~= "hello, " ++ _ ) ) // new: short version via ~= operator for modification
 )
 // new short version desugars to this (using access to default values):

diff --git a/defaults-and-copy-ideas.scala b/defaults-and-copy-ideas.scala
@@ -6,7 +6,7 @@ assert( foo.str == "test" ) // new: named access to default values
 case class Bar(str: String = "test")
 assert( Bar.apply.str == "test" ) // same for case classes via .apply method
 
-// REPRTIION-FREE .copy (aka lenses light)
+// REPETIION-FREE .copy (aka lenses light)
 
 case class Baz(bar: Bar)
 val b = Baz( Bar( "world" ) )

diff --git a/defaults-and-copy-ideas.scala b/defaults-and-copy-ideas.scala
@@ -6,7 +6,7 @@ assert( foo.str == "test" ) // new: named access to default values
 case class Bar(str: String = "test")
 assert( Bar.apply.str == "test" ) // same for case classes via .apply method
 
-// REPITIION-FREE .copy (aka lenses light)
+// REPRTIION-FREE .copy (aka lenses light)
 
 case class Baz(bar: Bar)
 val b = Baz( Bar( "world" ) )

diff --git a/defaults-and-copy-ideas → defaults-and-copy-ideas.scala b/defaults-and-copy-ideas → defaults-and-copy-ideas.scala
diff --git a/defaults-and-copy-ideas b/defaults-and-copy-ideas
@@ -0,0 +1,27 @@
+// DEFAULT VALUES
+
+def foo(str: String = "test") = ???
+assert( foo.str == "test" ) // new: named access to default values
+
+case class Bar(str: String = "test")
+assert( Bar.apply.str == "test" ) // same for case classes via .apply method
+
+// REPITIION-FREE .copy (aka lenses light)
+
+case class Baz(bar: Bar)
+val b = Baz( Bar( "world" ) )
+assert(
+  b.copy( bar = b.bar.copy( str = "hello, " ++ b.bar.str ) ) // old: having to repeat repeat b.bar
+  == b.copy( bar ~= _.copy( str ~= "hello, " ++ _ ) ) // new: short version via ~= operator for modification
+)
+// new short version desugars to this (using access to default values):
+b.copy( bar = b.copy.bar.copy( str = "hello, " ++ b.copy.bar.copy.str ) )
+
+// MODIFYING OVERRIDES
+
+class Foo{ def str = "world" }
+assert(
+  new Foo{ override str = "hello, " ++ super.str }.str // having to repeat `str` in override
+  == new Foo{ override str ~= "hello, " ++ _ }.str // new: modifying function based on parent value
+)
+