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Like natural languages, programming languages follow rules for syntax and semantics. There are thousands of programming languages [ 1 ] and new ones are created every year. Few languages ever become sufficiently popular that they are used by more than a few people, but professional programmers may use dozens of languages in a career.
There is a wide variety of syntax styles for declaring comments in source code. BlockComment in italics is used here to indicate block comment style. InlineComment in italics is used here to indicate inline comment style.
They are also typically sandboxed, and JavaScript was designed with Java's syntax and standard library in mind. In particular, all Java keywords were reserved in original JavaScript, JavaScript's standard library follows Java's naming conventions, and JavaScript's Math and Date objects are based on classes from Java 1.0.
Syntax highlight Over 110 languages 129 languages: Yes mixed mode: HTML + JavaScript and CSS, PHP, EJS; single mode: JavaScript, Java, JSON, CSS, Python, Ruby, XML, YAML (pluggable) limited mixed mode: HTML + JavaScript (no CSS), PHP + HTML (no JavaScript or CSS), Java, Perl, SQL only keywords
The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output . The JavaScript standard library lacks an official standard text output function (with the exception of document.write ).
Java is a statically typed object-oriented language that uses a syntax similar to (but incompatible with) C++. It includes a documentation system called Javadoc . The different goals in the development of C++ and Java resulted in different principles and design trade-offs between the languages.
Java is explicit about extending classes and implementing interfaces, while C# infers this from the kind of types a new class/interfacederives from. C# supports more features than Java, which to some extent is also evident in the syntax that specifies more keywords and more grammar rules than Java.
Nashorn: A JavaScript engine used in Oracle Java Development Kit (JDK) since version 8. [7] iv, ECMAScript Lexer / Parser / Interpreter / VM / method JIT written in C++. [8] CL-JavaScript: Can compile JavaScript to machine language on Common Lisp implementations that compile to machine language. [9]