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[[File:Whitespace in vim2.png|right|206px|thumb|Whitespace [[hello world program]] with syntax highlighting {{legend|#0000ab|tabs}} {{legend|#ab0000|spaces}}]] <!-- make SVG file -->
'''Whitespace''' is an [[esoteric programming language]] developed by Edwin Brady and Chris Morris at the [[University of Durham]] (also developers of the [[Kaya (programming language)|Kaya]] and [[Idris (programming language)|Idris]] programming languages). It was released on 1 April 2003 ([[April Fool's Day]]). Its name is a reference to [[whitespace character]]s. Unlike most programming languages, which ignore or assign little meaning to most whitespace characters, the Whitespace interpreter ignores any non-whitespace characters. Only [[Space character|spaces]], [[Tab character|tabs]] and [[linefeed]]s have meaning.<ref name="whitespace">{{cite web|url=http://compsoc.dur.ac.uk/whitespace/tutorial.php|title=Whitespace|website=Compsoc|access-date=2015-12-08|url-status=dead|archive-url=https://web.archive.org/web/20150618184706/http://compsoc.dur.ac.uk/whitespace/tutorial.php|archive-date=18 June 2015}}</ref> A consequence of this property is that a Whitespace program can easily be contained within the whitespace characters of a program written in another language, except possibly in languages which depend on spaces for syntax validity such as [[Python (programming language)|Python]], making the text a [[polyglot (computing)|polyglot]].
The [[programming language|language]] itself is an [[imperative programming|imperative]] [[stack-based language]]. The [[virtual machine]] on which the programs run has a stack and a [[dynamic memory allocation|heap]]. The programmer is free to push arbitrary-width integers onto the stack (currently there is no implementation of floating point numbers) and can also access the heap as a permanent store for variables and [[data structure]]s.▼
== History ==
▲on which the programs run has a stack and a [[dynamic memory allocation|heap]]. The programmer is free to push arbitrary-width integers onto the stack (currently there is no implementation of floating point numbers) and can also access the heap as a permanent store for variables and [[data structure]]s.
▲== History ==nguage]] on 1 April 2003.<ref>{{Cite web |url=http://developers.slashdot.org/story/03/04/01/0332202/New-Whitespace-Only-Programming-Language |title=New Whitespace-Only Programming Language |date=2003-04-01 |website=Slashdot |author=Timothy |access-date=2014-01-23}}</ref>
The idea of using whitespace characters as operators for the [[C++]] language had been facetiously suggested five years earlier by [[Bjarne Stroustrup]].<ref>{{cite web |url=http://www.stroustrup.com/whitespace98.pdf |title=Generalizing Overloading for C++2000 |first=Bjarne |last=Stroustrup |publisher=AT&T Labs |___location=Florham Park, NJ, USA |access-date=2014-01-23}}</ref>
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