Oct

Google announces Dart programming language

saurabh

Dart, Dart programming language, Dynamic Languages, Google announces Dart programming language, google dart, google new programming language, Javascript, STRUCTURED WEB PROGRAMMING

Google has built a brand-new programming language for ‘structured web programming, one that appears to be suited to browser-based apps. Two of the search giant’s engineers will discuss Dart, Google’s new language, at the Go to international software development conference next month. News of the new language was posted to the Goto website. There aren’t yet any technical details on Dart but the bios of the two Googlers presenting at Goto strongly suggest a bent towards programming for the web and browser

Technical Overview

Dart is a new class-based programming language for creating structured web applications. Developed with the goals of simplicity, efficiency, and scalability, the Dart language combines powerful new language features with familiar language constructs into a clear, readable syntax.

First off: the language comes as a technology preview, it is not yet in Chrome, it comes with syntax familiar to Javascript developers, Erlang-style/Actor-style concurrency. Comes with support to write applications for the iPad.

Update: clarification: the demoed iPad version was Dart code cross compiled to Javascript and executed

Characteristics:

Class-based single inheritance with interfaces
Optional static types
Reified Generics
Real lexical scoping
single threaded
Familiar syntax, Javascrpt-like

Syntactic features

class based
operator overloading
String interpolation “Hello ${foo}”
lambda syntax: (x) => x

Types in Dart:

optional
type annotations have no influence on compilation or execution: if arguments or variables have a wrong type, the code still works if the code is correct. The tooling will issue warnings.
reified Generics

Interfaces:

Interfaces with Factory implementations
interface person factory PersonFactory
interfaces have constructors; call to it will go to factory class declared in Interface

Concurrency with Isolates:

each Isolate is a conceptual process, Erlang-style
no sharing
communication via message passing
isolates have one or more ports
Isolates can run in parallel

The language is not done yet, and the team is looking for input. The language is currently not in Chrome.

Dart execution:

DartC compiles Dart to plain Javascript
a dedicated Dart VM can execute Dart
a third option: Dart comes with tools to create an image of the heap of an application and package it into an optimized format which can be loaded nearly instantly, reminiscient ofSmalltalk’s image system.

Tools:

based on Eclipse source but not an Eclipse plugin Update: clarification: this statement was made in the keynote, however the editor and tools are indeed Eclipse plugins.
auto completion support with types

A technology preview version of Dart and the tools is available for download now, and at the Google Code Dart project.

Get involved

This project is open source and will evolve with feedback and participation from the community. We have released the draft language specification at an early stage to gather responses from the developers who will be using this new language and infrastructure for web programming. Here are some additional links for learning more about Dart and providing your feedback:

Other pages in the Dart website (dartlang.org), such as tutorials, sample code, articles, and the latest draft of the Dart Language Specification
Dart project with issue tracker and source code
Dart discussion group (misc at dartlang.org)

saurabh

hey friends i have completed my B.Tech in CE from Ganpat University & now i am working as Android Middleware & Application Developer in one Private firm. i really enjoy programming…!!