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unnecessary_cast

Unnecessary cast.

Description

#

The analyzer produces this diagnostic when the value being cast is already known to be of the type that it's being cast to.

Example

#

The following code produces this diagnostic because n is already known to be an int as a result of the is test:

dart
void f(num n) {
  if (n is int) {
    (n as int).isEven;
  }
}

Common fixes

#

Remove the unnecessary cast:

dart
void f(num n) {
  if (n is int) {
    n.isEven;
  }
}