Hope (programming language): Difference between revisions

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'''Hope''' is a small [[functional (programming)|functional]] [[programming language]] developed in the 1970s at [[University of Edinburgh|Edinburgh University]].<ref name="BMS">Burstall R.M, MacQueen D.B, Sannella D.T. (1980) ''Hope: An Experimental Applicative Language''. Conference Record of the 1980 LISP Conference, Stanford University, pp. 136-143.</ref> It predates [[Miranda programming language|Miranda]] and [[Haskell (programming language)|Haskell]] and is contemporaneous with [[ML (programming language)|ML]] (also developed at Edinburgh). It is notable for being the first language with call-by-pattern evaluation{{Citation needed|reason=Prolog appeared in 1972 and has call-by-pattern evaluation with its 'rules'. SNOBOL is even older, and its 'patterns' may qualify as a hybrid between call-by-pattern and regular expression matching.|date=April 2013}} and [[algebraic data type]]s.{{Citation needed|date=April 2013}} Hope is an important language in the development of functional programming.

The name may have been derived from ''Hope Park Square'' in Edinburgh, at one time the ___location of the Department of Artificial Intelligence.

A Hope tutorial by Roger Bailey<ref>{{cite web|url=http://www.soi.city.ac.uk/~ross/Hope/hope_tut/hope_tut.html |title=A Hope Tutorial |publisher=Soi.city.ac.uk |date=1998-09-09 |accessdate=2013-11-07}}</ref> was featured in the August 1985 issue of [[Byte magazine|Byte]] on [[declarative programming]].<ref>{{cite web|url=http://www.devili.iki.fi/library/issue/136.en.html |title=HomeLib issue: BYTE - Volume 10, issue 8 (August, 1985) |publisher=Devili.iki.fi |date= |accessdate=2013-11-07}}</ref>

A factorial program in Hope is