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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: |