2 files changed, 8 insertions, 3 deletions
diff --git a/chapter25/docs/examples/BubbleSort.smp b/chapter25/docs/examples/BubbleSort.smp
index f2298c0c..864e26da 100644
--- a/chapter25/docs/examples/BubbleSort.smp
+++ b/chapter25/docs/examples/BubbleSort.smp
@@ -11,9 +11,7 @@ val sort = { sys.aryi64 nums ->
         done = true;
         for( var i = 0; i < nums.len-1; i++ )
             if( nums.buf[i] > nums.buf[i+1] ) {
-                int tmp = nums.buf[i];
-                nums.buf[i] = nums.buf[i+1];
-                nums.buf[i+1] = tmp; // Swap
+                nums.swap(i,i+1);
                 done = false;
             }
     }
diff --git a/chapter25/src/main/smp/sys/aryi64.smp b/chapter25/src/main/smp/sys/aryi64.smp
index 499431d8..8a154f34 100644
--- a/chapter25/src/main/smp/sys/aryi64.smp
+++ b/chapter25/src/main/smp/sys/aryi64.smp
@@ -35,6 +35,13 @@ struct aryi64 {
             str.num(buf[i]).add(',').add(' ');
         str.undo(2).add(']');
     };
+
+    val swap = { int i, int j ->
+        i64 tmp = buf[i];
+        buf[i] = buf[j];
+        buf[j] = tmp;
+        self;
+    };
 };