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Dart programs run in one of two modes. In "checked mode", which is not the default mode and must be turned on, dynamic type assertions are enabled. These type assertions can turn on if static types are provided in the code, and can catch some errors when types do not match. For example, if a method is annotated to return a String, but instead returns an integer, the dynamic type assertion will catch this and throw an exception. Running in "checked mode" is recommended for development and testing. Dart programs by default run in "production mode", which runs with all dynamic type assertions turned off. This is the default mode because it currently is the fastest way to run a Dart program. Deployment targets
Dart is designed to run in modern web browsers, either directly inside a Dart virtual machine...
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