array builtins

object/int.go

@@ -24,3 +24,9 @@ func (i *Integer) Equal(other Object) bool {
 	}
 	return false
 }
+func (i *Integer) Less(other Object) bool {
+	if obj, ok := other.(*Integer); ok {
+		return i.Value < obj.Value
+	}
+	return true
+}