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%c is not a part of JavaScript itself. It's a format specifier provided by modern browsers for styling the console. Whne you want to use it, it has to be the first parameter in the console. log() method.

If you have a function defined in your C code that you want to call as needed from JavaScript, you can do this using the Emscripten ccall() function, and the EMSCRIPTEN_KEEPALIVE declaration (which adds your functions to the exported functions list (see Why do functions in my C/C++ source code vanish when I compile to ...

Environment: C++ is a Platform dependent while Java is a platform-independent programming language. We have to write and run C++ code on the same platform. Java has the WORA (Write Once and Run Everywhere) feature by which we can write our code in one platform once and we can run the code anywhere.

So, to answer the question "What is JavaScript written in?" — JavaScript code itself is written in plain text, but the language was originally developed using C and C++. Modern implementations of JavaScript, like Google's V8 engine, are primarily written in C++.

C is commonly used for embedded computers and applications that require high performance such as operating systems. JavaScript was first embedded only in web pages, but it is finding a new role in server applications developed through Node. js.

Key differences between Java and JavaScript: Java is an OOP programming language while Java Script is an OOP scripting language. Java creates applications that run in a virtual machine or browser while JavaScript code is run on a browser only. Java code needs to be compiled while JavaScript code are all in text.

C is compiled in advance. JavaScript is interpreted and sometimes compiled at runtime with a just-in-time (JIT) compiler. C is statically typed. JavaScript is dynamically typed. C requires programmers to allocate and reclaim blocks of memory.

C++ is statically typed, while JavaScript is dynamically typed. When coding with a statically typed language, like C++, you need to declare every variable while you are writing your code. On the other hand, JavaScript is dynamically typed, which allows variables to change type at runtime.