Merge branch 'fix/typos-progfun1-week3' into 'master'

Fix typos

See merge request lamp/cs-210-functional-programming-2019!7

slides/sources/progfun1-3-5.md

@@ -5,8 +5,8 @@
 Enums: Motivation
 =================
 
-We have seen that case classes *aggregate several values* into a single abstraction.
-For instance, the `Rational` case class aggregates a numerator and a denominator.
+We have seen that classes can *aggregate several values* into a single abstraction.
+For instance, the `Rational` class aggregates a numerator and a denominator.
 
 Conversely, how could we define an abstraction *accepting alternative values*?
 
@@ -57,7 +57,7 @@ It is possible to enumerate all the values of an enum by calling the
 \begin{tabular}{ll}
  \verb@Color.values@              \wsf Array(Red, Green, Blue, Magenta) \\
  \verb@val c = Color.Green@       \wsf c: Color = Green \\
- \verb@p == Color.values(1)@      \wsf true
+ \verb@c == Color.values(1)@      \wsf true
 \end{tabular}
 
 Discriminate the Values of an Enumeration
@@ -83,7 +83,7 @@ Match Syntax
 - Default cases are written with an underscore, e.g.
 
 ~~~
-  def isPrimary(color: Color): Boolean = paradigm match
+  def isPrimary(color: Color): Boolean = color match
     case Magenta => false
     case _ => true
 ~~~