Dart Editor is a tool that designed to write programs. Dart supports classes as a fundamental structural building block for libraries and apps. Classes define the structure of an object, and you can extend them to create more specialized definitions. New features such as implicit interfaces and named constructors make it easier to say more while typing less. It includes lexical scoping and a convenient closure mechanism, libraries to create reusable modules of functionality, annotations and documentation that help clearly indicate your intent, remove the type annotations if you’re just scripting around or if you’re trying to express something that is challenging to express with a single type annotation, you can write code that is easier to understand through named parameters, create isolates for concurrent programming and to run third-party code more securely, asynchronous programming, explicit collections with generics, better for loops, and error handling with exceptions.