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   • What is the ProgId or CLSID for IE9's Javascript engine (code-named "Chakra")

     Top Answer

     Answered Aug 24, 2011 · 33 votes

     The CLSID for the Chakra Javascript engine installed with IE9 is {16d51579-a30b-4c8b-a276-0ff4dc41e755}.

     The InProcServer32 is %windir%\System32\jscript9.dll .

     There is no ProgId that I could find. That's a bit odd; normally paired ProgId and CLSID entries refer to each other. For a given COM object, the ProgId key in the registry has a subkey called CLSID, and the CLSID registry key has a subkey called ProgId, and they refer to each other. But the ProgId subkey for the IE9 CLSID is "JScript", which of course refers to the v5.8 Jscript CLSID. Not sure if this was a mistake by Microsoft, or a purposeful bit of obfuscation, because they don't want anyone using the Chakra engine outside of IE9. Looks purposeful to me.

     I learned of the CLSID by just searching the registry for jscript9.dll .

     If you have .NET code that hosts scripting engines, you can instantiate the IActiveScript object for the IE9 javascript engine ("Chakra") by using the CLSID directly. The code needs to be something like this:

     private const string clsIdPattern = @"^(?<curly>\{)?[a-zA-Z0-9]{8}(?:-[a-zA-Z0-9]{4}){3}-[a-zA-Z0-9]{12}(?(curly)\})$";-public ScriptEngine(string language){ if (language == null) throw new ArgumentNullException("language");- Type engineType = null;- if (Regex.IsMatch(language, clsIdPattern)) { // it's a CLSID var guid = new System.Guid(language); engineType = Type.GetTypeFromCLSID(guid, true); } else { // assume vanilla progId engineType = Type.GetTypeFromProgID(language, true); }- var engine = Activator.CreateInstance(engineType) as IActiveScript;-

     In the above, clsIdPattern is a regular expression that matches the familiar GUID format, either with or without surrounding curlies.

     Given the code above, you could pass "jscript", "Javascript", or "ECMAScript" and get the v5.8 JScript engine. Or you could pass "{16d51579-a30b-4c8b-a276-0ff4dc41e755}" and get the IE9 Javascript engine. Obviously you need to have IE9 installed in order for this to work.

     I just tried this and it works for simple cases. I'll be playing with that some more, real soon.

     If you want to run Chakra from WSH, like from cscript.exe, then you will need a ProgId, I think. If I create "Chakra" as a Progid in the registry, referring to the correct CLSID, I can run JS files through IE9's engine like this:

     cscript.exe module.js //E:Chakra -

     For example, after inserting the new "Chakra" ProgId, given a script like this:

     WScript.Echo( ScriptEngineMajorVersion() + "." + ScriptEngineMinorVersion() + "." + ScriptEngineBuildVersion());-

     ...the output is like this:

     C:\dev\js>Version.js5.8.16982-C:\dev\js>cscript.exe Version.js //E:Chakra9.0.16434-

     And here's the result of a test of AES encryption in Javascript, comparing Chakra with JScript 5.8:

     C:\dev\js\SlowAES>cscript.exe test.aes.jsAES encryption in Javascript.password : Albatros1salt : saltines (73616c74696e6573)iterations: 1000key : 172,52,20,51,98,71,49,195,14,31,141,51,129,8,94,66iv : 212,27,28,156,83,245,0,35,176,157,45,141,209,143,158,248plaintext : Hello, /r/javascript.ciphertext: fdebac9f1ed1a13bac58f3cc6558e8b0367a94245dbbfe53cacc4979799fc182decrypted : Hello, /r/javascript.elapsed : 5011ms-C:\dev\js\SlowAES>cscript.exe test.aes.js //E:ChakraAES encryption in Javascript.password : Albatros1salt : saltines (73616c74696e6573)iterations: 1000key : 172,52,20,51,98,71,49,195,14,31,141,51,129,8,94,66iv : 212,27,28,156,83,245,0,35,176,157,45,141,209,143,158,248plaintext : Hello, /r/javascript.ciphertext: fdebac9f1ed1a13bac58f3cc6558e8b0367a94245dbbfe53cacc4979799fc182decrypted : Hello, /r/javascript.elapsed : 2593ms-

     To set the ProgId in my registry, I used this:

     Windows Registry Editor Version 5.00-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID]@="Chakra"-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID]@="Chakra"-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra]@="JScript Language"-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra\CLSID]@="{16d51579-a30b-4c8b-a276-0ff4dc41e755}"-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra\OLEScript]-

     and to unexpose Chakra, or revert the registry, I did this:

     Windows Registry Editor Version 5.00-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID]@="JScript"-[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID]@="JScript"-[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra]-

     This registry script worked with x64 Windows; if you don't have x64, then you'll need to remove the WOW6432Node lines.

     Check all answers on Stack Overflow

     1/5

   • What is the difference between JavaScript Engine and JavaScript Runtime Environment

     Top Answer

     Answered Mar 13, 2015 · 188 votes

     Unlike C and other compiled languages, Javascript runs in a container - a program that reads your js codes and runs them. This program must do two things

     • parse your code and convert it to runnable commands
     • provide some objects to javascript so that it can interact with the outside world.

     The first part is called Engine and the second is Runtime.

     For example, the Chrome Browser and node.js use the same Engine - V8, but their Runtimes are different: in Chrome you have the window, DOM objects etc, while node gives you require, Buffers and processes.

     Check all answers on Stack Overflow

     2/5

   • What is the first class function in JavaScript ?

     First-Class Function

     A programming language is said to have First-class functions if functions in that language are treated like other variables. So the functions can be assigned to any other variable or passed as an argument or can be returned by another function. JavaScript treats function as a first-class citizen. This means that functions are simply a value and are just another type of object.

     Usage of First-Class Function

     • It can be stored as a value in a variable.
     • It can be returned by another function.
     • It can be passed into another function as a parameter.
     • It can also stored in an array, queue, or stack.
     • Also, It can have its own methods and property.

     Example 1: Let us take an example to understand more about the first-class function.

     Javascript

     const Arithmetics = {    add: (a, b) => {return a b a b...

     Check all answers on Geeksforgeeks

     3/5

   • What is the JavaScript Engine used in Opera Next (Or 12+)

     Top Answer

     Answered Jun 25, 2013 · 5 votes

     WebKit and Presto are not Javascript engines, but rendering engines. Opera previously used a Javascript engine called "Carakan", but have since started transitioning from Presto and Carakan to Blink and V8.

     Check all answers on Stack Overflow

     4/5

   • What is the most efficient way to get the first item from an associative array in JavaScript?

     Top Answer

     Answered Oct 07, 2008 · 46 votes

     There isn't really a first or last element in associative arrays (i.e. objects). The only order you can hope to acquire is the order the elements were saved by the parser -- and no guarantees for consistency with that.

     But, if you want the first to come up, the classic manner might actually be a bit easier:

     function getKey(data) { for (var prop in data) return prop;}

     Want to avoid inheritance properties?

     function getKey(data) { for (var prop in data) if (data.propertyIsEnumerable(prop)) return prop;}

     Check all answers on Stack Overflow

     5/5

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2. en.wikipedia.org › wiki › JavaScript_engineJavaScript engine - Wikipedia

   en.wikipedia.org › wiki › JavaScript_engine

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   The first JavaScript engine was created by Brendan Eich in 1995 for the Netscape Navigator web browser. It was a rudimentary interpreter for the nascent language Eich invented. (This evolved into the SpiderMonkey engine, still used by the Firefox browser.) Google debuted its Chrome browser in 2008, with the V8 JavaScript engine that was faster ...

3. www.freecodecamp.org › news › javascript-engine-andJavaScript Engine and Runtime Explained - freeCodeCamp.org

   www.freecodecamp.org › news › javascript-engine-and

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   Jan 16, 2024 · A JavaScript engine is simply a computer program that executes JavaScript code. It's responsible for translating human-readable JavaScript code into machine-readable instructions that the computer's hardware can execute. When you write JavaScript code and run it in a browser, the code doesn't directly interact with your computer's hardware. Instead, it

4. People also ask

   What was the first JavaScript engine?

   • The original Mocha JavaScript engine, ported from Netscape 3.0.2 browser. "Mocha" was the code name of the first JavaScript engine, originally written by Brendan Eich in his 10-day May 1995 sprint. For all of 1995 and most of 1996, Eich was the the only Netscape developer working full-time on the JavaScript engine.

   GitHub - doodlewind/mocha1995: ☕️ The world's first JavaScript engine

   github.com/doodlewind/mocha1995

   See all results for this question

   When did JavaScript first come out?

   • "Mocha" was the code name of the first JavaScript engine, originally written by Brendan Eich in his 10-day May 1995 sprint. For all of 1995 and most of 1996, Eich was the the only Netscape developer working full-time on the JavaScript engine. Untill August 1996, the Mocha codebase still consisted primarily of code from the 10-day prototype.

   GitHub - doodlewind/mocha1995: ☕️ The world's first JavaScript engine

   github.com/doodlewind/mocha1995

   See all results for this question

   What is a JavaScript engine?

   • A JavaScript engine is a software component that executes JavaScript code. The first JavaScript engines were mere interpreters, but all relevant modern engines use just-in-time compilation for improved performance. JavaScript engines are typically developed by web browser vendors, and every major browser has one.

   JavaScript engine - Wikipedia

   en.wikipedia.org/wiki/JavaScript_engine

   See all results for this question

   Which JavaScript engine is used in a web browser?

   • 3. Spider Monkey: SpiderMonkey is the first JavaScript engine, written by Brendan Eich at Netscape Communications, later released as open-source and currently maintained by the Mozilla Foundation. It is still used in the Firefox web browser. 4. Webkit: WebKit is developed by Apple and used in its Safari web browser, as well as all iOS web browsers.

   Introduction to Javascript Engines - GeeksforGeeks

   www.geeksforgeeks.org/introduction-to-javascript-engines/

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5. www.geeksforgeeks.org › introduction-to-javascriptIntroduction to Javascript Engines - GeeksforGeeks

   www.geeksforgeeks.org › introduction-to-javascript

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   Jun 19, 2023 · Spider Monkey: SpiderMonkey is the first JavaScript engine, written by Brendan Eich at Netscape Communications, later released as open-source and currently maintained by the Mozilla Foundation. It is still used in the Firefox web browser.

6. dev.to › rajaniraiyn › the-magical-world-ofThe Magical World of JavaScript Engines: Everything you Need ...

   dev.to › rajaniraiyn › the-magical-world-of

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   • The Beginning of Javascript Engines
   • Introduction of Google's V8 Engine
   • How Do Javascript Engines Work?
   • Popular Javascript Engines Available Today
   • The Bottom Line

   Brandon Eich created the JavaScript language in just 10 days under the code name Moksha for Netscape Navigator in 1995. The first JavaScript engine was called SpiderMonkey 🕷️, and it was also created by Eich. This engine reads JavaScript code and executes it on a computer, giving developers the power they need to create dynamic and interactive web...

   See full list on dev.to

   In 2006, Google introduced a game-changing engine called V8 ⚙️, written in C++. This engine was designed to be an optimising compiler and interpreter for JavaScript. It was hidden within the Chromium browser and led to the development of Node and Dino 🦖, which allowed developers to harness the full potential of JavaScript. The V8 engine was instru...

   See full list on dev.to

   JavaScript code is passed through the engine and converted into an abstract syntax tree. This abstract syntax tree can be executed through the Ignition interpreter or the top of an optimising compiler. The Ignition interpreter converts the code line by line into byte-code, while the top of an optimising compiler converts the entire code into an opt...

   See full list on dev.to

   Today, there are many popular JavaScript engines available, each with its own strengths and weaknesses. Some of the most popular engines include SMP8, which is known for its fast startup times and low memory usage on Apple devices. Another newer runtime called Deno is written in the physics programming language, making it not only a runtime but als...

   See full list on dev.to

   In conclusion, the world of JavaScript engines is vast, with many players and opinions for different purposes. The magic of JavaScript engine lies in the execution of the code through an Ignition interpreter or turbofan optimising compiler like V8. JavaScript developers today have a wide variety of engines to choose from, each with its unique stren...

   See full list on dev.to

7. github.com › doodlewind › mocha1995GitHub - doodlewind/mocha1995: ☕️ The world's first ...

   github.com › doodlewind › mocha1995

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   History. "Mocha" was the code name of the first JavaScript engine, originally written by Brendan Eich in his 10-day May 1995 sprint. For all of 1995 and most of 1996, Eich was the the only Netscape developer working full-time on the JavaScript engine.

8. www.freecodecamp.org › news › how-javascript-worksHow Does JavaScript Work Behind the Scenes? JS Engine and ...

   www.freecodecamp.org › news › how-javascript-works

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   May 30, 2023 · To fully optimize JavaScript code, the engine first creates an unoptimized version of the machine code so it can start executing immediately. While that is ongoing, the code is being re-optimized and recompiled in the background of the currently running program execution.

9. www.freecodecamp.org › news › execution-context-howJavaScript Execution Context – How JS Works Behind The Scenes

   www.freecodecamp.org › news › execution-context-how

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   Feb 10, 2022 · Global Execution Context (GEC) Function Execution Context (FEC) Let's take a detailed look at both. Global Execution Context (GEC) Whenever the JavaScript engine receives a script file, it first creates a default Execution Context known as the Global Execution Context (GEC).