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Code Quality Rank: L1
Programming language: C#
License: MIT License
Tags: Misc     JavaScript     ECMAScript    
Latest version: v3.0.0

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README

Jurassic

Build status

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: