functionaljava#176: Added min and max to Set

mperry · mperry · commit 63c87b8526ff · 2015-08-29T17:57:27.000+10:00
diff --git a/core/src/main/java/fj/data/Set.java b/core/src/main/java/fj/data/Set.java
@@ -4,6 +4,7 @@
 
 import static fj.Function.*;
 import static fj.data.Either.right;
+import static fj.data.Option.none;
 import static fj.data.Option.some;
 import static fj.function.Booleans.not;
 
@@ -387,6 +388,14 @@ public static <A> F<Set<A>, F<Set<A>, Set<A>>> minus() {
     return curry((s1, s2) -> s1.minus(s2));
   }
 
+    public Option<A> min() {
+        return isEmpty() ? none() : l().min().orElse(some(head()));
+    }
+
+    public Option<A> max() {
+        return isEmpty() ? none() : r().max().orElse(some(head()));
+    }
+
   /**
    * Returns the size of this set.
    *
