Editing JScript .NET (section)

{{short description|Programming language developed by Microsoft}}
{{multiple issues|
{{original research|date=November 2013}}
{{inline|date=November 2013}}
{{update|date=June 2015}}
}}
{{Infobox programming language
| name                   = JScript .NET
| paradigm               = [[multi-paradigm]]
| generation             = 
| year                   = 
| designer               = 
| developer              = [[Microsoft|Microsoft Corporation]]
| latest release version = 
| latest release date    = 
| typing                 = [[duck typing|duck]], [[weak typing|weak]], [[dynamic typing|dynamic]]
| implementations        = 
| dialects               = 
| influenced_by          = [[JScript]], [[ECMAScript]]
| influenced             = 
| platform               = [[.NET Framework]]
}}
{{Infobox file format
| name      = JScript .NET
| extension = .js
| mime      = 
}}
'''JScript .NET''' is a [[.NET Framework|.NET]] [[programming language]] developed by [[Microsoft]].

The primary differences between [[JScript]] and JScript .NET can be summarized as follows:

Firstly, JScript is a [[Script (computer programming)|script]]ing language, and as such [[computer program|programs]] (or more suggestively, [[Script (computer programming)|script]]s) can be executed without the need to compile the code first. This is not the case with the JScript .NET command-line compiler, since this next-generation version relies on the .NET [[Common Language Runtime]] (CLR) for execution, which requires that the code be compiled to [[Common Intermediate Language]] (CIL), formerly called Microsoft Intermediate Language (MSIL), code before it can be run. Nevertheless, JScript .NET still provides full support for interpreting code at runtime (e.g., via the <code>Function</code> constructor or the <code>[[eval#JavaScript|eval]]</code> function) and indeed the interpreter can be exposed by custom applications hosting the JScript .NET engine via the VSA{{Technical statement|reason=more on VSA interfaces|date=February 2012}} interfaces.

Secondly, JScript has a strong foundation in Microsoft's [[ActiveX]]/[[Component Object Model|COM]] technologies, and relies primarily on ActiveX components to provide much of its functionality (including database access via [[ActiveX Data Objects|ADO]], file handling, etc.), whereas JScript .NET uses the [[.NET Framework]] to provide equivalent functionality. For backwards-compatibility (or for where no .NET equivalent library exists), JScript .NET still provides full access to ActiveX objects via .NET / [[COM Interop]] using both the ActiveXObject constructor and the standard methods of the .NET '''Type''' class.

Although the .NET Framework and .NET languages such as [[C Sharp (programming language)|C#]] and [[Visual Basic .NET]] have seen widespread adoption, JScript .NET has never received much attention, by the media or by developers. It is not supported in Microsoft's premier development tool, [[Visual Studio .NET]]. However, [[ASP.NET]] supports JScript .NET.