There are many similarities and many differences between Java and JavaScript. That's why it's very common to confuse JavaScript with the programming language Java. At first, the similarities that remain, however, which are at the level of the syntax of the two languages, are still significant enough to be positively explored in an introduction to programming. This is what will be done in the remainder of this introduction to medium and large-scale programming, which will introduce the principles and show you how to create applications in a common lineup.
First, JavaScript is not properly a programming language, it is a language of “scripting“, that is, it is not compiled and executed. Its execution is done by the browser, and it depends on it. Applications built with the Java language are platform independent, compiled in "Java virtual machine“.
Furthermore, Java is a multi-object oriented language. While it is possible to “write” procedural applications in Java, the language is designed for creating objects. Now JavaScript, in turn, is not object oriented, and does not allow the definition of classes as it is done in Java, with inheritance and implementation of interfaces. However, it is still possible to write object-oriented applications in JavaScript, through the definition of functions.
At the syntax level, the most important difference between Java and JavaScript stems from the former being a well-known language, while the latter is the opposite extreme. In Java operations and functions are defined for specific types of variables, and trying to apply an operation or function on variables of a different type than the defined one results in an error, while in JavaScript everything is allowed.
In Java, every variable has to be declared is well defined, specifying the type, before being used. Once a variable is defined as a certain type, that definition cannot be changed.
Furthermore, functions in Java depend on variables of a defined type, and variables other than those proposed cannot be used in a function. As a result, there are coercion operators in Java, which obtain a numerical value from a variable of another type.
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