Jurassic

What is Jurassic?

Jurassic is an implementation of the ECMAScript language and runtime. It aims to provide the best performing and most standards-compliant implementation of JavaScript for .NET. Jurassic is not intended for end-users; instead it is intended to be integrated into .NET programs. If you are the author of a .NET program, you can use Jurassic to compile and execute JavaScript code.

Features

• Supports all ECMAScript 3 and ECMAScript 5 functionality, including ES5 strict mode
• Well tested - passes over five thousand unit tests (with over thirty thousand asserts)
• Simple yet powerful API
• Compiles JavaScript into .NET bytecode (CIL); not an interpreter
• Deployed as a single .NET assembly (no native code)
• Basic support for integrated debugging within Visual Studio
• Uses light-weight code generation, so generated code is fully garbage collected
• Tested on .NET 3.5, .NET 4 and Silverlight

How do I get it?

Install the NuGet package.

Usage

See the wiki for full usage details.

ECMAScript 6 status

Support for ECMAScript 6 is in progress. See http://kangax.github.io/compat-table/es6/ for the definition of each feature. The table below is correct as of version 3.1.

Feature|Status -------|------ Optimisation|   proper tail calls (tail call optimisation)|:x: Syntax|   default function parameters|4/7   rest parameters|:x:   spread syntax for iterable objects|:x:   object literal extensions|:white_check_mark: 6/6   for..of loops|6/9   octal and binary literals|:white_check_mark: 4/4   template literals|6/7   RegExp "y" and "u" flags|:x:   destructuring, declarations|:x:   destructuring, assignment|:x:   destructuring, parameters|:x:   Unicode code point escapes|:white_check_mark: 4/4   new.target|:white_check_mark: 2/2 Bindings|   const|:white_check_mark: 18/18   let|14/16   block-level function declaration[18]|:x: Functions|   arrow functions|:x:   class|:white_check_mark: 24/24   super|:white_check_mark: 8/8   generators|:x: Built-ins|   typed arrays|45/46   Map|18/19   Set|18/19   WeakMap|11/12   WeakSet|10/11   Proxy [25]|33/34   Reflect [26]|18/20   Promise|4/8   Symbol|:white_check_mark: 12/12   well-known symbols[27]|23/26 Built-in extensions|   Object static methods|:white_check_mark: 4/4   function "name" property|10/17   String static methods|:white_check_mark: 2/2   String.prototype methods|:white_check_mark: 10/10   RegExp.prototype properties|:white_check_mark: 6/6   Array static methods|8/11   Array.prototype methods|:white_check_mark: 10/10   Number properties|:white_check_mark: 9/9   Math methods|:white_check_mark: 17/17   Date.prototype[Symbol.toPrimitive]|:white_check_mark: 1/1 Subclassing|   Array is subclassable|9/11   RegExp is subclassable|:white_check_mark: 4/4   Function is subclassable|4/6   Promise is subclassable|:x:   miscellaneous subclassables|:x: Misc|   prototype of bound functions|1/5   Proxy, internal 'get' calls|19/36   Proxy, internal 'set' calls|7/11   Proxy, internal 'defineProperty' calls|:x:   Proxy, internal 'deleteProperty' calls|:x:   Proxy, internal 'getOwnPropertyDescriptor' calls|2/4   Proxy, internal 'ownKeys' calls|:white_check_mark: 3/3   Object static methods accept primitives|:white_check_mark: 10/10   own property order|5/7   Updated identifier syntax|1/3   miscellaneous|8/9 Annex b|   non-strict function semantics[35]|2/3   __proto__ in object literals [36]|:x:   Object.prototype.__proto__|1/6   String.prototype HTML methods|:white_check_mark: 3/3   RegExp.prototype.compile|1/2   RegExp syntax extensions|4/8   HTML-style comments|:x: