diff --git a/utils.go b/utils.go
index 56ca6e3..ba1ec81 100644
--- a/utils.go
+++ b/utils.go
@@ -24,6 +24,11 @@ func IsFloat(v any) (ok bool) {
 	return ok
 }
 
+func IsBool(v any) (ok bool) {
+	_, ok = v.(bool)
+	return ok
+}
+
 func IsList(v any) (ok bool) {
 	_, ok = v.(*ListType)
 	return ok
@@ -34,6 +39,11 @@ func IsDict(v any) (ok bool) {
 	return ok
 }
 
+func IsFract(v any) (ok bool) {
+	_, ok = v.(*fraction)
+	return ok
+}
+
 func IsNumber(v any) (ok bool) {
 	return IsFloat(v) || IsInteger(v)
 }