compare: add Bool comparison

compare/compare.go

@@ -50,3 +50,13 @@ func Time(a, b time.Time) int { return a.Compare(b) }
 func Reversed[T any](c func(a, b T) int) func(a, b T) int {
 	return func(a, b T) int { return -c(a, b) }
 }
+
+// Bool is a comparison function for bool values that orders false before true.
+func Bool(a, b bool) int {
+	if a == b {
+		return 0
+	} else if a {
+		return 1
+	}
+	return -1
+}

compare/compare_test.go

@@ -110,3 +110,20 @@ func TestReversed(t *testing.T) {
 		t.Errorf("Reversed output is not sorted: %v", buf)
 	}
 }
+
+func TestBool(t *testing.T) {
+	tests := []struct {
+		a, b bool
+		want int
+	}{
+		{false, false, 0},
+		{false, true, -1},
+		{true, false, 1},
+		{true, true, 0},
+	}
+	for _, tc := range tests {
+		if got := compare.Bool(tc.a, tc.b); got != tc.want {
+			t.Errorf("Bool(%v, %v): got %v, want %v", tc.a, tc.b, got, tc.want)
+		}
+	}
+}