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Q, by Kris Kowal, conforms to Promises/A+ 1.1 [62] RSVP.js, conforms to Promises/A+ 1.1 [63] YUI's [64] promise class [65] conforms to the Promises/A+ 1.0 specification. Bluebird, by Petka Antonov [66] The Closure Library's promise package conforms to the Promises/A+ specification. See Promise/A+'s list for more implementations based on the ...
First, the async keyword indicates to C# that the method is asynchronous, meaning that it may use an arbitrary number of await expressions and will bind the result to a promise. [1]: 165–168 The return type, Task<T>, is C#'s analogue to the concept of a promise, and here is indicated to have a result value of type int.
JavaScript (/ ˈ dʒ ɑː v ə s k r ɪ p t /), often abbreviated as JS, is a programming language and core technology of the World Wide Web, alongside HTML and CSS. Ninety-nine percent of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
JavaScript Object Notation (JSON) is often used as an alternative format for data interchange, [15] although other formats such as preformatted HTML or plain text can also be used. [16] A variety of popular JavaScript libraries, including JQuery, include abstractions to assist in executing Ajax requests.
In the following C code, function print_number uses parameter get_number as a blocking callback. print_number is called with get_answer_to_most_important_question which acts as a callback function. When run the output is: "Value: 42".
Here is an example of using the map and reduce operators. We create an observable from a list of numbers. The map operator will then multiply each number by two and return an observable. The reduce operator will then sum up all the numbers provided to it (the value of 0 is the starting point).
ng-class Conditionally apply a class, depending on the value of a Boolean expression. ng-controller Specifies a JavaScript controller class that evaluates HTML expressions. ng-if Basic if statement directive that instantiates the following element if the conditions are true. When the condition is false, the element is removed from the DOM.
ECMAScript 2015 (ES6) added the promise construct to simplify asynchronous logic. Browsers have since implemented the alternative fetch() interface to achieve the same functionality as XHR using promises instead of callbacks.