11/18/2023 0 Comments Java script basicsIndividual program statements should appear on a separate line to make your code easier to read and debug, and should be terminated with a semicolon. Above all, your coding style should be consistent.Ī script can consist of a single JavaScript statement, or a whole series of JavaScript statements, function declarations and control structures. Even if this is not the case, it is wise to adhere to common programming conventions in order to ensure that your code is both readable and easy to maintain. As you can see from the third example, we no longer need the type attribute because JavaScript is the default client-side scripting language for HTML5.Ĭoding style is often a matter of personal choice although if you work with an established development team there may be a set of style guidelines in place that you are expected to follow. You may see this from time to time in legacy code, but use of the language attribute was deprecated in HTML4 in favour of the type attribute which, as you can see, we have used for the second example. The first example tells the browser specifically that the scripting language being used is JavaScript using the language attribute. Consider the following code examples, which all do the same thing: tags so that the browser knows that it is dealing with JavaScript code. If JavaScript code does appear within an HTML document, whether in the head of the document or somewhere within the body of the document, it must appear inside a pair of opening and closing. It also means that the code used to implement any common JavaScript functionality can be stored in a single source file rather than being duplicated across multiple HTML documents. Doing so allows you to keep your JavaScript code separate from your HTML code, making it easier to maintain both. There are good arguments, however, for removing JavaScript code to an external file and linking to that file from your HTML document. For most of the examples in these pages, the example code we provide will be in one of these two locations for the sake of convenience. tags of an HTML document, although it can also be found between the opening and closing. It is often found, for example, between the opening and closing. In terms of program logic and flow control, JavaScript perhaps most closely resembles the C programming language, although it also exhibits features found in a number of other languages.īecause of the nature of the environment in which JavaScript is used, there is some latitude as to where JavaScript code can be placed. According to JavaScript's creator Brendan Eich, JavaScript borrows most of its syntax from the Java programming language, although he acknowledges the influence of other languages, including Perl. JavaScript syntax is the set of rules that must be followed in order to produce correctly structured JavaScript code. It is often characterised as a "multi-paradigm" language because it readily lends itself to a number of different approaches, including both functional and object-oriented programming techniques. JavaScript is a powerful and versatile scripting language that is continuing to evolve in order to meet the requirements of the constantly changing online environment it was created to serve - the World Wide Web.
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