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A snippet of JavaScript code with keywords highlighted in different colors. 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.
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. [111]
Previously, JavaScript only supported function scoping using the keyword var, but ECMAScript 2015 added the keywords let and const, allowing JavaScript to support both block scoping and function scoping. JavaScript supports automatic semicolon insertion, meaning that semicolons that normally terminate a statement in C may be omitted in ...
Its features include exponentiation operator ** for numbers, await, async keywords for asynchronous programming (as a preparation for ES2017), and the Array.prototype.includes function. [5] The exponentiation operator is equivalent to Math.pow , but provides a simpler syntax similar to languages like Python, F#, Perl, and Ruby.
JavaScript added support for async/await in 2017 as part of ECMAScript 2017 JavaScript edition. Rust added support for async/await with version 1.39.0 in 2019 using the async keyword and the .await postfix operator, both introduced in the 2018 edition of the language.
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Meta elements are tags used in HTML and XHTML documents to provide structured metadata about a Web page.They are part of a web page's head section. Multiple Meta elements with different attributes can be used on the same page.
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