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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 .
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. [11]
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. [114]
JavaScript: semicolon separated (but often inserted as statement terminator) Kotlin: semicolon separated (but sometimes implicitly inserted on newlines) Lua: whitespace separated (semicolon optional) Mathematica a.k.a. Wolfram semicolon separated MATLAB
JavaScript as of ECMAScript 2015, [32] and via the keywords async and await since ECMAScript 2017 [33] Lucid (dataflow only) Some Lisps. Clojure [34] MultiLisp.NET via Tasks C#, since .NET Framework 4.5, [22] via the keywords async and await [23]
In JavaScript, which is a programming or scripting language used extensively in web browsers, this is an important keyword, although what it evaluates to depends on where it is used. When used outside any function, in global space, this refers to the enclosing object, which in this case is the enclosing browser window, the window object.
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.
typeof, alternately also typeOf, and TypeOf, is an operator provided by several programming languages to determine the data type of a variable.This is useful when constructing programs that must accept multiple types of data without explicitly specifying the type.