not_binary_operator

'{0}' isn't a binary operator.

The analyzer produces this diagnostic when an operator that can only be used as a unary operator is used as a binary operator.

The following code produces this diagnostic because the operator ~ can only be used as a unary operator:

var a = 5 ~ 3;

Replace the operator with the correct binary operator:

var a = 5 - 3;

Unless stated otherwise, the documentation on this site reflects Dart 3.8.1. Page last updated on 2025-05-08. View source or report an issue.