Update Extractor.scala

Author: Atry

src/main/scala/com/thoughtworks/Extractor.scala

@@ -6,30 +6,30 @@ package com.thoughtworks
   * @example
     {{{
     import com.thoughtworks.Extractor._
-
-    // Convert a PartialFunction to a pattern
+    
+    // Define a PartialFunction
     val pf: PartialFunction[Int, String] = {
       case 1 => "matched by PartialFunction"
     }
-
-    // Convert an optional function to a pattern
+    
+    // Define an optional function
     val f: Int => Option[String] = { i =>
       if (i == 2) {
         Some("matched by optional function")
       } else {
         None
       }
     }
-
+    
     // Convert an optional function to a PartialFunction
     val pf2: PartialFunction[Int, String] = f.unlift
-
+    
     util.Random.nextInt(4) match {
-      case pf.extract(m) =>
+      case pf.extract(m) => // Convert a PartialFunction to a pattern
         println(m)
-      case f.extract(m) =>
+      case f.extract(m) => // Convert an optional function to a pattern
         println(m)
-      case pf2.extract(m) =>
+      case pf2.extract(m) => // Convert a PartialFunction to a pattern
         throw new AssertionError("This case should never occur because it has the same condition as `f.extract`.")
       case _ =>
         println("Not matched")