🎯 Dart - The Full Course

Master the fundamantals of Dart before jumping into Flutter.

Gert started with Dart in 100 Seconds

This repo is a refrence for the videos in the course.

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operators.dart Typecase example throws "type 'int' is not a subtype of type 'String' in type cast" error

This code throws the error:

var number = 23 as String; // throws "type 'int' is not a subtype of type 'String' in type cast" error
number is String; // true

I only tested in dart 2.18 and 2.17, and the error is the same in both.

Here's a dartpad showing a repro.

operators.dart error "NoSuchMethodError: The method 'call' was called on null."

This code fails when run in VScode as well as with the official Dart 2.14 and 2.18 docker images (the only ones I tried).

Specifically, this block throws the error:

  var paint = Paint() // Throws "NoSuchMethodError: The method 'call' was called on null."
    ..color = 'black'
    ..strokeCap = 'round'
    ..strokeWidth = 5.0;

Repro with official dart docker image:

docker run -i dart:2.14 bash -c 'curl -fsLO https://raw.githubusercontent.com/fireship-io/dart-course/main/bin/operators.dart && dart operators.dart'
Unhandled exception:
NoSuchMethodError: The method 'call' was called on null.
Receiver: null
Tried calling: call()
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:63:5)
#1      main (file:///root/operators.dart:32:20)
#2      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:283:19)
#3      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

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