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In computer programming, a callback is a function that is stored as data (a reference) and designed to be called by another function – often back to the original abstraction layer. A function that accepts a callback parameter may be designed to call back before returning to its caller which is known as synchronous or blocking.
For example, if a customer from Spain is calling a phone number in Australia, and it costs 8 cents per minute to phone Spain from the US (the callback, which is an incoming call) and 20 cents per minute to phone Australia from the US (the destination call, which is an outgoing call), then the caller will pay a total of 28 US cents a minute ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 7 March 2025. High-level programming language Not to be confused with Java (programming language), Javanese script, or ECMAScript. JavaScript Screenshot of JavaScript source code Paradigm Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented Designed by Brendan Eich of ...
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 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.
Callback (comedy), a joke which refers to one previously told; Callback (computer programming), callable (i.e. function) that is passed as data and expected to be called by another callable. Callback (telecommunications), the telecommunications event that occurs when the originator of a call is immediately called back in a second call as a response
Handlebars.js and Mustache are both logicless templating languages that keep the view and the code separated like we all know they should be. [8] Handlebars differs from its predecessor in that, within Block Expressions (similar to sections in Mustache), Helpers allow custom function through explicit user-written code for that block.
A small piece of code in most general-purpose programming languages, this program is used to illustrate a language's basic syntax. Such program is often the first written by a student of a new programming language, [ 1 ] but such a program can also be used as a sanity check to ensure that the computer software intended to compile or run source ...