Exceptions

Finally

// To ensure that some code runs whether or not an exception is thrown try { cookFood(); } catch (e) { print('Error: $e'); // Handle the exception first. } finally { cleanKitchen(); // Then clean up. } 

Catch

try { int c = 3/0; print(c); } on IntegerDivisionByZeroException { // A specific exception print('Can not divide integer by 0.') } on Exception catch (e) { // Anything else that is an exception print('Unknown exception: $e'); } catch (e) { // No specified type, handles all print('Something really unknown: $e'); } 

Throw

// throws or raises and exception throw IntegerDivisionByZeroException(); // You can also throw arbitrary objects throw "Product out of stock!"; 
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