avoid_as
Avoid using as
.
This rule has been removed as of the latest Dart releases.
Details
#AVOID using as
.
If you know the type is correct, use an assertion or assign to a more narrowly-typed variable (this avoids the type check in release mode; as
is not compiled out in release mode). If you don't know whether the type is correct, check using is
(this avoids the exception that as
raises).
BAD:
(pm as Person).firstName = 'Seth';
GOOD:
if (pm is Person)
pm.firstName = 'Seth';
but certainly not
BAD:
try {
(pm as Person).firstName = 'Seth';
} on CastError { }
Note that an exception is made in the case of dynamic
since the cast has no performance impact.
OK:
HasScrollDirection scrollable = renderObject as dynamic;
Usage
#To enable the avoid_as
rule, add avoid_as
under linter > rules in your analysis_options.yaml
file:
linter:
rules:
- avoid_as