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JSX (JavaScript XML, formally JavaScript Syntax eXtension) is an XML-like extension to the JavaScript language syntax. [1] Initially created by Facebook for use with React , JSX has been adopted by multiple web frameworks .
On February 16, 2019, React 16.8 was released to the public, introducing React Hooks. [18] Hooks are functions that let developers "hook into" React state and lifecycle features from function components. [19] Notably, Hooks do not work inside classes — they let developers use more features of React without classes. [20]
[8] Array.sort is now guaranteed to be stable, meaning that elements with equal sorting keys will not change relative order before and after the sort operation. Array.prototype.flat(depth=1) flattens an array to a specified depth, meaning that all subarray elements (up to the specified depth) are concatenated recursively.
MessagePack is more compact than JSON, but imposes limitations on array and integer sizes.On the other hand, it allows binary data and non-UTF-8 encoded strings. In JSON, map keys have to be strings, but in MessagePack there is no such limitation and any type can be a map key, including types like maps and arrays, and, like YAML, numbers.
A 2013 study has found that 75% of users only ask one question, 65% only answer one question, and only 8% of users answer more than 5 questions. [34] To empower a wider group of users to ask questions and then answer, Stack Overflow created a mentorship program resulting in users having a 50% increase in score on average. [ 35 ]
In several languages, such as Common Lisp, Clojure, Lua, Object Pascal, Python, Ruby, and JavaScript, there is no need for the Elvis operator, because the language's logical disjunction operator (typically || or or) is short-circuiting and returns its first operand if it would evaluate to a truthy value, and otherwise its second operand, which ...
Learn how to enable JavaScript in your browser to access additional AOL features and content.
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 ...