From 765ddc9e51305d6ba703666f42e67ae3fcc91058 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=A9my=20Zurcher?= <jeremy@asynk.ch>
Date: Sun, 28 Apr 2013 00:08:00 +0200
Subject: Scala : sandbox Scala : add 8-pattern-matching

---
 Scala/sandbox/0-main.scala             |  1 +
 Scala/sandbox/8-pattern-matching.scala | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 Scala/sandbox/8-pattern-matching.scala

diff --git a/Scala/sandbox/0-main.scala b/Scala/sandbox/0-main.scala
index 6f0edf3..b68b57e 100644
--- a/Scala/sandbox/0-main.scala
+++ b/Scala/sandbox/0-main.scala
@@ -10,5 +10,6 @@ object Main  extends App {
     IntList.run
     Natural.run
     Variance.run
+    PatternMatching.run
 
 }
diff --git a/Scala/sandbox/8-pattern-matching.scala b/Scala/sandbox/8-pattern-matching.scala
new file mode 100644
index 0000000..36beb68
--- /dev/null
+++ b/Scala/sandbox/8-pattern-matching.scala
@@ -0,0 +1,29 @@
+object PatternMatching
+{
+  trait Expr {
+    def eval: Int = this match {
+      case Number(n) => n
+      case Sum(e1, e2) => e1.eval + e2.eval
+    }
+    def show: String = this match {
+      case Number(n) => n.toString
+      case Sum(e1, e2) => e1.show + " + " + e2.show
+    }
+  }
+
+  case class Number(n: Int) extends Expr
+  case class Sum(e1: Expr, e2: Expr) extends Expr
+
+
+  def eval1(e: Expr): Int = e match {
+    case Number(n) => n
+    case Sum(e1, e2) => eval1(e1) + eval1(e2)
+  }
+
+  def run = {
+    println("PatternMatching")
+    println( eval1(Sum(Number(1), Number(2))) )
+    val e = Sum(Number(1), Number(2))
+    println( e.show + " = " + e.eval )
+  }
+}
-- 
cgit v1.1-2-g2b99