Wrong answer

[jaydangar]

Wrong answer

[apgapg]

Try 0-4+4
I think library needs something on left of minus sign

[jaydangar]

Yes, but it shouldn't be the case. This should be added as a bug.

[apgapg]

I understand your concern, but internally lib calls
left - right() to subtract expressions. In above case left is missing so it might give some issue.
Still this needs to be fixed

[apgapg]

@jaydangar
It worked fine in my case

 const expression1 = '-4+4';
 final result1 = ExpressionUtils.evaluate(
        expression: expression1,
        map: map,
      );
 expect(result1, 0);

The test case passed.
Expression Utils is just a wrapper of the lib in my case