non_ bool_ operand
The operands of the operator '{0}' must be assignable to 'bool'.
Description
#
The analyzer produces this diagnostic when one of the operands of either
the
&&
or
||
operator doesn't have the type
bool
.
Example
#
The following code produces this diagnostic because
a
isn't a Boolean
value:
int a = 3;
bool b = a || a > 1;
Common fixes
#Change the operand to a Boolean value:
int a = 3;
bool b = a == 0 || a > 1;
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.