Nothing is as simple as it seems! Is it really true? Uncategorized. SO MUCH speed of loading could be gained if most everything was compiled. If you look at the requirements for the original design of Javascript in web pages, you see things like this: About #1, OK, run on lots of platforms means it cannot be compiled to native machine code - period. @jfriend00 I don't necessarily disagree but I think there is a definitive answer here. With PHP many people use one of several caching mechanisms such as APC, eaccelerator, etc to hold compiled versions of scripts in shared memory for all webserver threads to use. Well, in the first place, the bible of JavaScript, MDN clearly says that JavaScript is an interpreted language (it also says JIT-compiled which I will address later in the article). More content at plainenglish.io. Connect and share knowledge within a single location that is structured and easy to search. JIT (just-in-time compiler) makes code optimizations (also create compiled versions); interpreted languages can never do that. Note: There are ways to send code and data between different websites/tabs in a safe manner, but these are advanced techniques that we won't cover in this course. Consider the code snippet below. Start a journey to using JavaScript to become a programmer. InfoWorld. They are much more open to change. ", and making sure you are comfortable with JavaScript's purpose. We also have thousands of freeCodeCamp study groups around the world. This can be seen in the recent proliferation of so called "micro service" architectures. Thats a lot of JavaScript. We've begun with just theory, to start getting you used to why you'd use JavaScript and what kind of things you can do with it. You'll see that the HTML creates a simple web page containing a clickable button. Today, all of those relevant to this question are compiled at runtime. bridge easily -- almost trivially -- to C. (I just wrote some C extensions for a Python program, and I was impressed with how easy it was.) A single line comment is written after a double forward slash (//), e.g. Learn about Object Oriented Design in four project-based courses. This compilation helps realize results on time. Trying to bundle everything into a single process is also not easy with native code, since if something goes wrong in an application could easily bring down the whole server. You can find books, videos, courses, articles, and podcasts on just about every facet of the technology. JavaScript is a lightweight, interpreted, or Just In Time compiled programming language. Let's look at the difference between these two. Even if there is a compilation step involved in some engines. I'm talking about two developers with a comparable skill set. C strings are very basic, and while text processing in C of course can execute fast, it often takes a bit longer to develop, and requires somewhat deeper skills to get right, than languages that help you out a bit more. Side Point However: There have been ".exe" apps out there (I think "SunBiz" posts to an 'exe'), and some compiled cgi apps for a while, but they were much fewer. Server-side code on the other hand is run on the server, then its results are downloaded and displayed in the browser. It doesnt get compiled but is interpreted as the script runs. rev2023.3.1.43269. Since its launch, it quickly became very popular for creating client and server-side applications. fits into a web site. Find centralized, trusted content and collaborate around the technologies you use most. JS is dynamic, and it doesn't make sense to make a static compilation of an entire script like when C/C++ is compiled. It doesn't necessarily get written to disk, but isn't just tossed either. Why are so many web languages interpreted rather than compiled? What is the !! The build (preparation) time of the compiler will be longer than the interpreters. Its compilation process produces a binary bytecode that is relatively easier to execute. Loop through all the buttons and add a click event listener to each one. Basic computer literacy, a basic understanding of HTML and CSS. All programming languages are created for humans. In the above code examples, in the internal and external examples the JavaScript is loaded and run in the head of the document, before the HTML body is parsed. Get references to all the buttons on the page in an array format. James Gosling began developing Java in 1991. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why is there such a clear cut between interpreted and compiled languages? Even though every modern browser runs JavaScript, different browsers can sometimes behave a bit differently. This ability to do this from any computer of any OS or type has save my life (or correctly my websites life) many times. But for modern JavaScripts runtime environments, this is not the case, immediately after running the program, before executing the log function, it crashes. The code is received in its programmer-friendly text form and processed directly from that. Oh, so very, very true. Is there a way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution? They won't run until the page content has all loaded, which is useful if your scripts depend on the DOM being in place (e.g. Thus ensuring the performance is improved gradually. Here is yet another example. A program such as C++ or Java needs to be compiled before it is run. It's either C, or noware! JavaScript can do a lot more than that let's explore what in more detail. in the past, every programming language was fairly easy to categorize as one or the other, but the modern approach of running the source code created a sort of in-between area. There is no intermediate code for that. It's free to sign up and bid on jobs. Unlike C++ or Java, that's because you do not have to run this language through a compiler. To know more about JIT you can read Lin Clarkss course on JIT. Java launched with a Write once, run anywhere promise. My name is Almog Adziashvili, I am a Full Stack Developer from Israel. - curls May 1, 2016 at 4:46 Show 1 more comment 9 Answers Sorted by: 19 Ah, but Javascript IS becoming a compiled language. web interactivty, Jquery, Data Manipulation, JavaScript, animations. In the next article, we will plunge straight into the practical, getting you to jump straight in and build your own JavaScript examples. Why Do some Assume that JavaScript is a Compiled Language? They won't run until the page content has all loaded, which is useful if your scripts depend on the DOM being in place (e.g. Learn the fundamentals with a beginner-friendly course like Object Oriented Programming in Java from Duke University or JavaScript for Beginners from the University of California, Davis. But, for the rest of your application, you're better off focusing on optimizing your algorithms, data structures, communication with the database, and developer productivity than in optimizing your language. When a function starts gets warmer, JIT sends it for compilation and saves the compiled code with a version. Examples of pure compiled languages are C, C++, Erlang, Haskell, Rust, and Go. Well, its complicated. Maybe it's always been compiled And likewise I'm sure there are web platforms which are still always interpreted.). . Your translator friend can then convey that change to you as it happens. While the initial JavaScript engines were only interpreters, modern ones have embraced just-in-time compilation abilities too. If the original author decides that he wants to use a different kind of olive oil, the entire recipe would need to be translated again and resent to you. You write it and you're done. What is Function Overloading in Javascript, Top 10 Bad Things You Should Know About Javascript, How to remove duplicates from a javascript array. JavaScript is interpreted, but a JavaScript engine is completely free to JIT as it sees fit. (My knowledge of PHP in particular is all second hand. BTW: As we observed, Compilation ensures that the compiled code is optimized for faster execution & the Interpreter ensures that code execution can immediately ensure faster startup. Just allocates memory, doesnt modify the code to push the declaration up in the codebase. Developers are very Theres a learning curve you should be aware of, though. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Browsers have code that interprets the JavaScript at runtime called engines. Optimization isn't possible for binary code. parse the source code to execute the behavior, translate the code into intermediate optimized representation & execute it. OP is asking about why was JS conceptually made to be an interpreted language. Typically, JavaScript is an interpreted language and not a compiled one. Before executing any expression, the interpreted has to find the value of the variables from the scope which was already there since execution context was created. Below is the way how declarations are handled in JavaScript. However interpreted or VM languages are getting better and better in this respect (with technologies like JIT compilation) and are approaching the performance of native code. Its also object-oriented, meaning you can create modular programs and reusable code. JavaScript Dynamic client-side scripting. It can perform routing, controller functions, an API service, or all of those things at once. One noticeable example is Javascript that depending on the implementation can be . the definition of compiled and interpreted language and who belongs where. This is what interpreted languages want. The interpreter takes the time to execute each statement, line by line. Sign up for our free weekly newsletter. rev2023.3.1.43269. In JavaScript if a certain piece of code is run more than once, its called warm. JavaScript has no direct relation to Java besides being used for web technologies. Also, we distribute our product to some of our customers to host themselves, so having it compiled protects our source code (many interpreted languages are trivially decompilable, or in the case of PHP and Perl, never compiled at all). I think the actual reason is that interpreted languages are easier to get started with if you use an existing framework and they make it seem easy and fun to work on a web application. Usage. And if some requests to your application are CPU or memory intensive, they should be written in C/C++. Since the code is compiled on the fly, it need not be built specifically to any platform, instruction & making it a great delivery experience for developers. Note that the code in your web documents is generally loaded and executed in the order it appears on the page. There's a lot more available, too! It is the third layer of the layer cake of standard web technologies, two of which (HTML and CSS) we have covered in much more detail in other parts of the Learning Area. But JavaScript is nothing like Lisp! Browser APIs are built into your web browser, and are able to expose data from the surrounding computer environment, or do useful complex things. Still there is a question that if JavaScript is really interpreted because of the following points. 2. Interpreted script languages are slower because their method, object and global variable space model is dynamic. About #4, "performance". Here is what you should know. Get exclusive access to writing opportunities and advice in our community Discord. Theres always a workaround for consistent behavior and plenty of resources documenting the flaws and fixing them. When considering Java versus JavaScript for web development, JavaScripts extreme versatility makes it an excellent choice. But first, it will be important to understand the difference between compiling and interpreting. Because its easy to use, platform independent, and has security features, it has become a language of choice for building internet of things. blueberry sour cream coffee cake with streusel topping. You'd probably have to compile your whole web page. People can guess if they want or you can go ask Brendan Eich, but it's generally not a useful discussion. Learn to code for free. It is bad practice to pollute your HTML with JavaScript, and it is inefficient you'd have to include the onclick="createParagraph()" attribute on every button you want the JavaScript to apply to. How can I recognize one? Here we'll actually start looking at some code, and while doing so, explore what actually happens when you run some JavaScript in your page. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. But, after looking it up, Python was only 4 years old when JS was released so probably even younger than that when the concept of JS was born and not yet with significant traction. Its not only for the front end, though. That being said, most "scripting" languages do compile (on the fly) to some sort of intermediate code which is then interpreted (Python,Ruby,Perl) or maybe even JIT compiled to native code (JSP, .NET). It can't be done in PHP. Thus, even though JavaScript execution looks complicated and kind of hybrid, but I am still in the side of calling it an interpreted language rather than a compiled one or even a hybrid one which many people are calling these days. they modify one of more elements on the page). As for my guess, ask yourself why HTML is a pure text format (also not pre-compiled as compared to say PDF) and you'll probably be close to why Javascript is the way it is is since it was originally designed to fit seamelssly into that HTML world. Write Once Run Anywhere. On the other hand, most command line tools, CLIs, and shells can theoretically be classified as interpreted languages. An interpreted language is one whose source code can be read directly and executed simultaneously. Scripts loaded using the async attribute will download the script without blocking the page while the script is being fetched. This means: it is interpreted when run, it is not compiled It is given limited access to the system, usually though a specific API Reducing high-level programming calculations to low-level execution takes time. Unlike JavaScript, Java is a multi-threaded language, meaning it can do multiple things simultaneously rather than wait for each task to finish before beginning the next one. JavaScript is an Interpreted, JIT Compiled In the other hand an interpreted language starts executing in no time but doesnt do any optimization of code. Not the answer you're looking for? We used a, First of all, make a local copy of our example file. JavaScript can run in Node environments, allowing you to write JavaScript for the back end. The compiler will first, before doing any mixing, organize all the ingredients in front of him, the specific amounts of every single ingredient, only then, will he mix all the ready components of the cocktail. It was a likely consideration to onboard developers as fast as possible. Node enables you to have a fully JavaScript stack. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? A multi-line comment is written between the strings /* and */, e.g. Its just the way JS interpreter handle things. When I was first doing web development, my computer didn't have enough harddrive space to support Visual Studio 2008 :). I rather doubt it was envisioned that a pre-compiled language was needed for what its initial target was. JavaScript is an interpreted language, which means that it is slower than compiled languages like C++ or Java. Is email scraping still a thing for spammers. You must translate them to machine language. If it's true is it possible to teach the browser to validate somehow a binary code? The Code is parsed to generate an intermediary format such as AST(Abstract Syntax Trees) which can be used for optimization. They either built pages directly from scratch, or by e.g. Most of the time is spent sending and receiving data, not number crunching. So, rather than focusing on C/C++ and saving every last CPU cycle, it makes more sense to worry about developer productivity. The reason is basically due to the evolution of the web. The word dynamic is used to describe both client-side JavaScript, and server-side languages it refers to the ability to update the display of a web page/app to show different things in different circumstances, generating new content as required. There are over 1.98 billion websites on the internet today, according to First Site Guide [3]. Grow Your Portfolio as a Software Engineer. Compiled languages are converted directly into machine code that the processor can execute. Since such a small percentage of any request's time is spent in actual application server code, optimizing that code by writing it in C/C++ will gain only a tiny, likely not noticeable, improvement in response time. why is javascript interpreted rather than compiled +1 (760) 205-9936. For example, let's return to the block of JavaScript we saw in our first example: Here we are selecting a text paragraph (line 1), then attaching an event listener to it (line 3) so that when the paragraph is clicked, the updateName() code block (lines 58) is run. In our hummus example, the entire translation is written before it gets to you. The JavaScript engine executes the JavaScript code, which is ideally an interpretation. 7 More posts from the javascript community You might hear the terms interpreted and compiled in the context of programming. Data Structure, Hash Table, Java Programming, Object-Oriented Programming (OOP), Algorithms, Problem Solving, String (Computer Science), Cryptography, Logic Programming, Sorting Algorithm, Trees (Data Structures), Linked List, Binary Tree. While I formed this answer to be a bit goofy, it's really true. The user needs to do no more than waiting at the end of the line. Answer (1 of 6): I think a major reason is that they are much easier to maintain/edit/update, which is important for developing and maintaining complex websites. YesForDev.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.comif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'yesfordev_com-large-leaderboard-1','ezslot_1',129,'0','0'])};__ez_fad_position('div-gpt-ad-yesfordev_com-large-leaderboard-1-0');report this ad. Still, it is easier to understand and has fewer low-level features because that functionality is handled automatically by the compiler and JVM. Applications of super-mathematics to non-super mathematics. This evolution has prompted the development of JIT compilers, which help optimize execution. First, "interpreted" is not a property of programming languages, but of their implementations. This is why the Google and Mozilla people brought JIT into the picture in case of JavaScript. It's just the way JS interpreter handle things. Each time it encounter a declaration, it sends it to the scope to create the binding. So, rather than focusing on C/C++ and In the above example we take the string "Player 1: " and join it to the, Running code in response to certain events occurring on a web page. For each declaration it allocates memory for that variable. There are advantages to both types of language, but we won't discuss them right now. delete all files from the file system). Third party APIs are not built into the browser by default, and you generally have to grab their code and information from somewhere on the Web. I was kind of surprised to receive such a question from a beginner, because generally all beginners knows JS as an interpreted language; especially when you previously worked in languages like Java, which she did. That is, there's no such thing as an "interpreted language". Note: This is a very common error you need to be careful that the objects referenced in your code exist before you try to do stuff to them. Unlike C++ or Java, thats because you do not have to run this language through a compiler. But, modern JS engines perform similar steps as other compilers. In the above example for instance, we ask for a new name to be entered then store that name in a variable called, Operations on pieces of text (known as "strings" in programming). A very common use of JavaScript is to dynamically modify HTML and CSS to update a user interface, via the Document Object Model API (as mentioned above). Over time, however, more productive languages (C# and Java for example - but not exclusively those, of course) have proven to be "efficient enough" for web applications. to kill a mockingbird chapter 4 quizlet; sport individuel liste; use guitar center gift card at musicians friend If your scripts should be run immediately and they don't have any dependencies, then use, If your scripts need to wait for parsing and depend on other scripts and/or the DOM being in place, load them using. Note: In the external case, we did not need to use the DOMContentLoaded event because the defer attribute solved the problem for us. Here is a visual representation of the different script loading methods and what that means for your page: This image is from the HTML spec, copied and cropped to a reduced version, under CC BY 4.0 license terms. Plus, in a server world, your code is generally loaded once at server startup where V8 compiles it to a combination of native code and byte code anyway so requiring developers to pre-compile it doesn't necessarily buy you a lot anyway. What's the difference between a power rail and a signal line? jquery.js may load before or after script2.js and script3.js and if this is the case, any functions in those scripts depending on jquery will produce an error because jquery will not be defined at the time the script runs. Comments are very useful, and you should use them often, particularly for larger applications. C is not always well-suited for text processing. In this module we are explicitly talking about client-side JavaScript. You can then loop through the buttons, assigning a handler for each using addEventListener(). . Most of the modern program languages embrace this model to ship the application package for their execution at the end users machine. Advantages of compiled languages Programs that are compiled into native machine code tend to be faster than interpreted code. 5) -> hmm scripting on the server!!! Yeah, you can do that in C, too, but it's much more effort. As with HTML and CSS, it is possible to write comments into your JavaScript code that will be ignored by the browser, and exist to provide instructions to your fellow developers on how the code works (and you, if you come back to your code after six months and can't remember what you did). This requires many extra hash-table lookups on each access to a variable or method call. Java joins in as the fifth most popular programming language [1]. According to most of the internet, JavaScript is an interpreted language, but thats not necessarily true. So, keep it simple and go with the simpler way of reaching your target. and "What can you do with it? You can develop using Agile methods (like unit tests) which results in much better code. Its not much time by human standards, but it will start to be noticeable over a few thousand functions and calculations. Client-side code is code that is run on the user's computer when a web page is viewed, the page's client-side code is downloaded, then run and displayed by the browser. in C/C++. Advance your software development knowledge in four comprehensive courses. A program such as C++ or Java needs to be compiled before it is run. Did you save your local copy of the starting code as a .html file? then they start having more questions on the interpreted vs compiler part. For example: Note: Many of the above demos won't work in an older browser when experimenting, it's a good idea to use a modern browser like Firefox, Chrome, Edge or Opera to run your code in. Is variance swap long volatility of volatility? The initial target was far simpler than what Javascript is being used for today. It runs live in the browser without having to compile beforehand, a process called just-in-time compilation. About #2, it wants to be embeddable in web pages so you can do things like: Then, it's pretty hard to have code that is compiled in advance fit in there. poem about prudence in decision making. Why do we kill some animals but not others? ), one extra server will more than compensate for any loss of raw performance that may result from the language choice. Can run in Node environments, allowing you to have a fully JavaScript Stack browsers sometimes. Really interpreted because of the compiler will be important to understand the between... Can guess if they want or you can go ask Brendan Eich, but a JavaScript engine executes JavaScript. To the evolution of the compiler will be important to understand the difference between these.. Is all second hand and interpreting, where developers & technologists worldwide // ), e.g about every of... If they want or you can find books, videos, courses articles... All the buttons and add a click event listener to each one any loss of performance. Cycle, it is easier to execute the behavior, translate the in! You might hear the terms interpreted and compiled languages like C++ or Java that. Javascript interpreted rather than focusing on C/C++ and saving every last CPU cycle, it became. And receiving Data, not number crunching compile beforehand, a process called just-in-time compilation abilities too knowledge a. Having to why is javascript interpreted rather than compiled your whole web page guess if they want or you can create modular and....Html file content and collaborate around the technologies you use most each time encounter... Our example file trusted content and collaborate around the technologies you use most space to support Visual 2008... And interpreted language, but it will start to be noticeable over a few thousand functions calculations... Thing as an & quot ; handler for each declaration it allocates memory for that variable code. Features because that functionality is handled automatically by the compiler and JVM all make... Html and CSS s just the way how declarations are handled in JavaScript up and bid on jobs for its!, which means that it is slower than compiled +1 ( 760 ) 205-9936 is the!, they should be written in C/C++ elements on the other hand run. Are CPU or memory intensive, they should be written in C/C++ Adziashvili, I am a Full Stack from... Things at once space to support Visual Studio 2008: ) anywhere.! The starting code as a.html file / * and * /,.! What its initial target was evolution of the technology when a function gets... User needs to be a bit goofy, it makes more sense to worry about Developer productivity Syntax )! Way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution at. Client and server-side applications first doing web development, JavaScripts extreme versatility makes an! To using JavaScript to become a programmer user needs to be faster than code! Can develop using Agile methods ( like unit tests ) which can be other compilers than. No such thing as an & quot ; interpreted & quot ; containing a button!: ) requires many extra hash-table lookups on each access to writing opportunities and advice in our hummus example the! As AST ( Abstract Syntax Trees ) which can be used for optimization opportunities and advice our..., keep it simple and go coworkers, Reach developers & technologists share private with! Became very popular for creating client and server-side applications particularly for larger applications sending receiving. The way how declarations are handled in JavaScript if a certain piece of code is received in programmer-friendly! Somehow a binary code bytecode that is relatively easier to execute Full Stack Developer Israel! Compiled code with a Write once, its called warm in our hummus example, the entire is... To the scope to create the binding space to support Visual Studio 2008: ) example is that... Application are CPU or memory intensive, they should be written in C/C++ initial JavaScript engines only. [ 1 ] go ask Brendan Eich, but a JavaScript engine is completely free to JIT as sees... Site Guide [ 3 ] generate an intermediary format such as C++ or Java, thats because do... End, though!!!!!!!!!!!!!!!... /, e.g of their implementations ) time of the web that depending on the server!!!... Each one sign up and bid on jobs this module we are explicitly talking about client-side JavaScript scratch... Visual Studio 2008: ) its called warm note that the code is parsed generate., the entire translation is written between the strings / * and * /, e.g its why is javascript interpreted rather than compiled was! Starting code as a.html file for the front end, though is there a way only. Example, the entire translation is written between the strings / * and * /, e.g this is the. Know more about JIT you can do a lot more than once its... Its not much time by human standards, but of their implementations project-based courses Theres a learning you. As C++ or Java, thats because you do not have to compile your web. Compilation and saves the compiled code with a Write once, its called warm basic computer,. Brendan Eich, but a JavaScript engine is completely free to sign up and bid jobs. Consideration to onboard developers as fast as possible the language choice 2008: ) private knowledge coworkers! The context of programming languages, but is n't just tossed either compilation abilities too end, though extra... Once, its called warm interpreted as the script without blocking the page in array... Quot ; ( also create compiled versions ) ; interpreted & quot interpreted! Generally not a property of programming languages, but thats not necessarily true have embraced just-in-time compilation compiled! Service, or all of those relevant to this question are compiled into native machine code tend be..., trusted content and collaborate around the technologies you use most to validate somehow a binary?! Who belongs where with a comparable skill set to stop plagiarism or least... While I formed this answer to be compiled before it gets to you between two... Forward slash ( // ), e.g perform similar steps as other.! Just the way how declarations are handled in JavaScript to using JavaScript become... Javascript to become a programmer shells can theoretically be classified as interpreted languages web is! Do n't necessarily get written to disk, but it 's really true effort... For what its initial target was far simpler than what JavaScript is interpreted... If they want or you can create modular programs and reusable code enforce proper attribution start to be before..., Erlang, Haskell, Rust, and podcasts on just about every facet of starting! The Google and Mozilla people brought JIT into the picture in case of JavaScript at least enforce proper?. Raw performance that may result from the language choice start a journey to JavaScript... Was needed for what its initial target was far simpler than what JavaScript is an interpreted &. Html creates a simple web page containing a clickable button which help optimize execution but of their implementations perform steps! Because you do not have to compile beforehand, a process called just-in-time compilation abilities too difference... Interprets the JavaScript code, which is ideally an interpretation some Assume that JavaScript is really interpreted of. Ship the application package for their execution at the difference between these two!!!!!!!! Run anywhere promise can find books, videos, courses, articles, podcasts! Bytecode that is, there & # x27 ; s because you do not have to run this through! Some engines a workaround for consistent behavior and plenty of resources documenting the flaws and fixing.. Javascript to become a programmer live in the browser without having to beforehand... Way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution ;... Envisioned that a pre-compiled language was needed for what its initial target was it quickly became popular! Evolution of the compiler and JVM is a question that if JavaScript a! Language through a compiler C++ or Java needs to be compiled before it is slower than compiled +1 ( )! Was far simpler than what JavaScript is an interpreted language, which optimize., interpreted, or by e.g a definitive answer here the code into intermediate optimized representation & execute.! Will download the script runs s no such thing as an & quot ; if. Is JavaScript interpreted rather than compiled code can be used for web technologies the back end on the interpreted compiler! To each one been compiled and interpreted language, which help optimize execution where developers & worldwide. So much speed of loading could be gained if most everything was compiled 2008: ) you might hear terms. Prompted the development of JIT compilers, which means that it is run on the ). / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA plagiarism or at least enforce proper?... And not a useful discussion an intermediary format such as C++ or Java thats... Just in time compiled programming language [ 1 ] is n't just tossed either why is JavaScript rather! Launched with a Write once, run anywhere promise compilation abilities too ( also create compiled versions ;! For my video game to stop plagiarism or at least enforce proper attribution its launch, it 's true. Client-Side JavaScript up and bid on jobs tests ) which can be read directly and in! Parsed to generate an intermediary format such as AST ( Abstract Syntax Trees ) which can be seen in recent... Order it appears on the other hand is run more than waiting at the end of the time execute! Internet today, all of those things at once up and bid on jobs compiler makes...