![]() Whether you're completely new to coding, or you're coming to JavaScript from another language, our Modern JavaScript Fundamentals course goes through everything you need to get up and running with one of the most popular and dynamic languages in use today. If you're learning JavaScript for the first time then you'll want a course that starts at the very beginning and covers everything about the language that a beginner needs to know. It's a first class language with a rich and vibrant ecosystem and an enthusiastic community dedicated to its continual development. JavaScript is one of the most popular and dynamic languages in use today, allowing the creation of rich experiences delivered via the web to desktops, tablets and mobile devices. If you want to learn more about the structure of the language and how to use JavaScript, check out our tutorial. This wasn't always the case in the early years of JavaScript it used to work a bit differently from browser to browser. JavaScript is standardized (its official name being ECMAScript) which means that it will work the same in any browser. Most high-level languages are interpreted, and most interpreted languages are high-level. The interpreter reads your code and converts it to machine instructions. Instead, the code is run by an intermediary piece of software called an interpreter (in this case, it is part of the web browser). ![]() But JavaScript is interpreted (just like PHP), meaning that there is no compiler. In compiled languages, the code you write must be converted to a machine-readable form before it can be run. For example, in JavaScript you could pass either a string or a number to the same JavaScript function, or you could have a JavaScript array that stores data of mixed types. In contrast, untyped languages are much more flexible about how types are used and defined. Untyped. If you have any programming experience, then you've likely come across statically typed languages that require you to declare the type of variables.This is a powerful feature of JavaScript, and it makes possible frameworks that can adapt the language to very different contexts and ways of working. Languages that are dynamic allow developers to add new code or change the structure of objects while the program is running. You don't have to manage memory, you don't have to know what type of processor is running, and you don't have to deal with things like pointers (such as in languages like C or Assembly). When a programming language is high-level, you can code it without needing to know details about the host computer. It has been standardized in the ECMAScript language specification. Wikipedia defines it this way: JavaScript is a high-level, dynamic, untyped, and interpreted programming language. ![]() Actually, it's the language that runs in the browser-if you want to make an interactive web page, JavaScript is the language to use. You've likely heard JavaScript referred to as "a client-side language", which is another way of saying that it's a programming language that runs in a web browser.
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