Dart is a programming language, which was originally developed by Google and then was given the ECMA standard. It is used for building web, server and mobile applications.
The are three basic options, how to execute Dart’s code.
Dart SDK contains stand-alone Dart VM, which allows Dart to execute command lines in environment. Regarding to the tools being often written in Dart, this usage is a critical part of SDK. These tools contain dart2js compiler and the package manager of the pub. Dart contains complete standard library, which allows users to write fully functional app systems, as are e. g. customized web servers.
Dart’s code can be pre-compiled to source code. Application standing for the usage of Flutter, SDK for mobile apps developed in Dart, are uploaded into application stores in this form.
Google implemented Flutter for native development of mobile apps as for Android as for iOS. Flutter is SDK for the mobile apps’ creation, which is complemented by Framework, widgets and tools, which give developers the option to build and deploy mobile app. Flutter works with Firebase and other SDK for mobile apps’ creation and it is an open-source.
Snapshots are a part of Dart VM’s core. They are files, which store objects and other data regarding to the executing.
Dart programs can be compiled into the snapshot files. These files contain the whole programming code and dependencies, which are pre-parsed and ready for executing. Thanks to that the maximally fast executing is possible.
Dart’s core libraries can be compiled to snapshot file, which enables fast loading of libraries. Most of the standard distributions of main Dart VM has pre-set snapshots for the main libraries, which are used during executing.
Dart is very asynchronous language. It can use isolates for parallel executing. Regarding to the isolates sending messages, it is needed to find a way, how to serialize the message. It is solved with the help of snapshots, which are generalized from the object and then are passed over to another isolate for deserialization.