why is javascript interpreted rather than compiled

Interpreted script languages are slower because their method, object and global variable space model is dynamic. Most of the modern program languages embrace this model to ship the application package for their execution at the end users machine. Its on par or faster than most other modern compiled languages and much faster than interpreted languages, making it a good choice for robust native applications. This means: it is interpreted when run, it is not compiled It is given limited access to the system, usually though a specific API parse the source code to execute the behavior, translate the code into intermediate optimized representation & execute it. All browser compatibility updates at a glance, Frequently asked questions about MDN Plus. That creates an entirely new paradigm and browser (that expects pre-compiled code and HTML). JavaScript is an Interpreted, JIT Compiled In the early days of Javascript, it was an auxiliary language to help add some client-side logic to web pages. why is javascript interpreted rather than compiled. The source code is passed through a program called a compiler, which translates it into bytecode that the machine understands and can execute. 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. It can perform routing, controller functions, an API service, or all of those things at once. We didn't use the defer solution for the internal JavaScript example because defer only works for external scripts. Note: You can see this version on GitHub as apply-javascript-external.html and script.js (see it live too). The execution of the generated is monitored continuously & any code unit which has the scope for optimization is passed through the compilation step to generate the optimized code for the same. This is because the process of translating code at run time adds to the overhead, and can cause the program to be slower overall. The most important differences between a compiled and an interpreted language is; the compiled one takes a longer time to prepare itself to start executing, as it has to take care of lexing the entire codebase, making awesome optimizations etc. Note: Try editing your version of apply-javascript.html and add a few more buttons into the file. A single line comment is written after a double forward slash (//), e.g. A multi-line comment is written between the strings /* and */, e.g. blueberry sour cream coffee cake with streusel topping. So hoisting is nothing but the game of execution context and not code modification, unlike many websites describe it. Comments are very useful, and you should use them often, particularly for larger applications. What's the difference between tilde(~) and caret(^) in package.json? Lisp's central data structure is the list. In this case, your friend is the interpreter for the interpreted version of the recipe. The variety in Javascript is a special thing that other programming languages can hardly do. While I formed this answer to be a bit goofy, it's really true. Java is very secure. The problem with this solution is that loading/parsing of the script is completely blocked until the HTML DOM has been loaded. 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. It is particularly suited for mobile and browser games, meaning you can make games for almost any device with a web browser.. Whereas CSS uses elements to apply external stylesheets and