diff --git a/hash_map/hash_map.go b/hash_map/hash_map.go
index 487020a..8a17aa3 100644
--- a/hash_map/hash_map.go
+++ b/hash_map/hash_map.go
@@ -49,8 +49,13 @@ func (this *HashMap) Conj(key any, val any) *HashMap {
 	return Conj(this, key, val)
 }
 
-func String(this *HashMap) string {
-	if this == nil {
+func (this *HashMap) IsEmpty() bool {
+	return len(this._map) == 0
+
+}
+
+func (this *HashMap) String() string {
+	if this.IsEmpty() {
 		return "{}"
 	}
 	var sb strings.Builder
@@ -63,8 +68,5 @@ func String(this *HashMap) string {
 		sb.WriteRune(' ')
 	}
 	return sb.String()[:sb.Len()-2] + "}"
-}
 
-func (this *HashMap) String() string {
-	return String(this)
 }