![]() click) which will launch the callback queue. Sometimes, the data from stack will sit in Web APIs container until an action is triggered (i.e. Web APIs are not a part of the JavaScript engine, but of the runtime environment usually provided by the browser you are working with. The second container is called the call stack, which is when the system finds an actionable item (function call) and sends it to the stack to be processed. It is unstructured storage filled with unprocessed objects and variables. The heap, also called the ‘memory heap’, is the first container in the environment. ![]() Some of the JRE glossary you need to know before we proceed: The heap In a nutshell, JRE acts as a bridge between your program and the operating system by giving access to some of its libraries. Inside this container, the Javascript engine will provide additional features to your scripts that you can use at runtime. JRE is a place or a container where your program will be executed. Instead, you will find yourself interacting with JRE most of the time. In practice, you do not usually interact with Javascript engines directly. What is Javascript Runtime Environment (JRE) Javascript can understand plain text script thanks to the javascript engine which is responsible for translating and executing source code on a computer’s central processing unit (CPU). How did it come to be? Well, Javascript is an interpreted programming language, meaning it can understand source code without having to rely on binary code prior to execution, which is way more efficient than writing code in the string of 0s and 1s. ![]() Javascript is the most well-known programming language in the world. Read More: Healthy Work Routine for Software Engineers Understanding Javascript engine You may have known that Javascript is a single-threaded language when it’s using a callback queue, but do you know what is actually going on behind the code string? In this article, we will cover an introduction to JRE how it works, and the differences between a browser’s and node’s runtime environment. Whether you have just started learning to code or want to know more about the language mechanism, understanding the Javascript Runtime Environment (JRE) will be a great thing to learn for any aspiring developer.
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