Channels ▼
RSS

Database

Microsoft TypeScript 0.9 JavaScript Now Live


Microsoft has updated the TypeScript JavaScript-related open source language that compiles to plain JavaScript. This version 0.9 release still hosted on CodePlex comes after an early technical preview last October.

More Insights

White Papers

More >>

Reports

More >>

Webcasts

More >>

This "milestone in the language's evolution" adds tooling capabilities offered for the language in Visual Studio. Microsoft says that it is now ready for "application-scale" JavaScript development.

New in this version is generics functionality. This intelligence will take advantage of the strong type inference that TypeScript already provides to provide better static error reporting and improved tooling, in many cases without any additional type annotations.

NOTE: An explanation of generics (most highly requested feature by 0.8 users ) from the MSDN details its ability to capture relationships between inputs and outputs in APIs. "[Thus] enabling richer type checking for better error reporting and tools. For example, generics allow the typing of the Array#map function from JavaScript to relate the element type of the array with the parameter to the callback function ('T' below), and the return type of the callback function with the return type of 'map' ('U' below)."

The compiler has been reengineered to work with projects in excess of 100,000 lines of code with minimal slowdown. As a result of its openness, more than a dozen editors now support TypeScript, enabling use across multiple major platforms.

Microsoft Developer Division VP Soma Somasegar says that TypeScript has already been "positively impacting" web development, even as an early technical preview. "Hundreds of developers are engaging with the project across the forums, issue tracker, and source code forks," he said.

Integration with popular build systems, a collection of library typings at DefinitelyTyped, test tools, and application models are available thanks to the TypeScript developer ecosystem.

Somasegar explains that in addition to generics, the language service has been completely rewritten for much-improved interactive performance. "Building web and Windows Store applications should now feel more responsive for IntelliSense, code navigation, and refactoring, especially as projects grow in size."


Related Reading






Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.
 

Video