September 2017 Update

Task/Optional-parameters/Go/optional-parameters-1.go

@@ -1,5 +1,20 @@
+type cell string
+
 type spec struct {
-    ordering func(cell, cell) bool
+    less     func(cell, cell) bool
     column   int
     reverse  bool
 }
+
+func newSpec() (s spec) {
+    // initialize any defaults
+    return
+}
+
+// sort with all defaults
+t.sort(newSpec())
+
+// reverse sort
+s := newSpec
+s.reverse = true
+t.sort(s)