Catch an 'as' typecast exception in flutter

Question

how can i catch an 'as' typecast exception in flutter. For example this causes an expection as the cast wasn't successful.

final success = mapJson['success'] as String;

In Swift we can use a guard let or an if let statement. Is there something similar for flutter/dart?

Answer 1

Extending the Answer of @Christopher you can even catch specific exceptions using the on block and execute exception specific code:

try {

// ...

 } on SomeException catch(e) {

//Handle exception of type SomeException
  print(e)

} catch(e) {

 //Handle all other exceptions
 print(e)

} finally {

  // code that should always execute; irrespective of the exception 
 }