|
Elvis Operator
In certain computer programming languages, the Elvis operator, often written ?:, is a binary operator that returns its first operand if that operand evaluates to a true value, and otherwise evaluates and returns its second operand. This is identical to a short-circuit ''or'' with "last value" semantics. The notation of the Elvis operator was inspired by the ternary conditional operator, ? : since the Elvis operator expression A ?: B is approximately equivalent to the ternary conditional A ? A : B. The name "Elvis operator" refers to the fact that when its common notation, ?:, is viewed sideways, it resembles an emoticon of Elvis Presley with his signature hairstyle. A similar operator is the null coalescing operator, where the boolean truth check is replaced with a check for non- null instead. This is usually written ??, and can be seen in languages like C#. Alternative syntaxes In several languages, such as Common Lisp, Clojure, Lua, Object Pascal, Perl, Python, Ruby ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Programming
Computer programming is the process of performing a particular computation (or more generally, accomplishing a specific computing result), usually by designing and building an executable computer program. Programming involves tasks such as analysis, generating algorithms, profiling algorithms' accuracy and resource consumption, and the implementation of algorithms (usually in a chosen programming language, commonly referred to as coding). The source code of a program is written in one or more languages that are intelligible to programmers, rather than machine code, which is directly executed by the central processing unit. The purpose of programming is to find a sequence of instructions that will automate the performance of a task (which can be as complex as an operating system) on a computer, often for solving a given problem. Proficient programming thus usually requires expertise in several different subjects, including knowledge of the application domain, specialized algorit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JavaScript
JavaScript (), often abbreviated as JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. As of 2022, 98% of websites use JavaScript on the client side for webpage behavior, often incorporating third-party libraries. All major web browsers have a dedicated JavaScript engine to execute the code on users' devices. JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard. It has dynamic typing, prototype-based object-orientation, and first-class functions. It is multi-paradigm, supporting event-driven, functional, and imperative programming styles. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures, and the Document Object Model (DOM). The ECMAScript standard does not include any input/output (I/O), such as networking, storage, or graphics facilities. In practice, the web bro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xtend
Xtend is a general-purpose high-level programming language for the Java Virtual Machine. Syntactically and semantically Xtend has its roots in the Java programming language but focuses on a more concise syntax and some additional functionality such as type inference, extension methods, and operator overloading. Being primarily an object-oriented language, it also integrates features known from functional programming, e.g. lambda expressions. Xtend is statically typed and uses Java's type system without modifications. It is compiled to Java code and thereby seamlessly integrates with all existing Java libraries. The language Xtend and its IDE is developed as a project at Eclipse.org and participates in the annual Eclipse release train. The code is open source under the Eclipse Public License. Yet, the language can be compiled and run independently of the Eclipse platform. History Xtend originated from Xtext, which is the technology used to define the language and the editor. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CFML
ColdFusion Markup Language, more commonly known as CFML, is a scripting language for web development that runs on the JVM, the .NET framework, and Google App Engine. Multiple commercial and open source implementations of CFML engines are available, including Adobe ColdFusion, Lucee, New Atlanta BlueDragon (who offer both a Java-based and a .NET-based version), Railo, and Open BlueDragon as well as other CFML server engines. Synopsis In its simplest form, like many other web scripting languages, CFML augments standard HTML files with database commands, conditional operators, high-level formatting functions, and other elements to produce web applications. CFML also includes numerous other constructs including ColdFusion Components (CFCs), CFML's version of objects, that allow for separation of business logic from presentation. CFML can be written using either tags or CFScript, which resembles JavaScript (ECMA script). The pages in a CFML application include the server-sid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ColdFusion
Adobe ColdFusion is a commercial rapid web-application development computing platform created by J. J. Allaire in 1995. (The programming language used with that platform is also commonly called ColdFusion, though is more accurately known as CFML.) ColdFusion was originally designed to make it easier to connect simple HTML pages to a database. By version 2 (1996), it became a full platform that included an IDE in addition to a full scripting language. Overview One of the distinguishing features of ColdFusion is its associated scripting language, ColdFusion Markup Language (CFML). CFML compares to the scripting components of ASP, JSP, and PHP in purpose and features, but its tag syntax more closely resembles HTML, while its script syntax resembles JavaScript. ''ColdFusion'' is often used synonymously with '' CFML'', but there are additional CFML application servers besides ColdFusion, and ColdFusion supports programming languages other than CFML, such as server-side Acti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Null-coalescing Operator
The null coalescing operator (called the Logical Defined-Or operator in Perl) is a binary operator that is part of the syntax for a basic Conditional (programming), conditional expression in several programming languages, including C Sharp (programming language), C#, PowerShell as of version 7.0.0, Perl as of version 5.10, Swift (programming language), Swift, and PHP 7.0.0. While its behavior differs between implementations, the null coalescing operator generally returns the result of its left-most operand if it exists and is not Nullable type, null, and otherwise returns the right-most operand. This behavior allows a default value to be defined for cases where a more specific value is not available. In contrast to the ternary ?:, conditional if operator used as x ? x : y, but like the binary Elvis operator used as x ?: y, the null coalescing operator is a binary operator and thus evaluates its operands at most once, which is significant if the evaluation of x has Side effect (com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
