{{Short description|Interactive, extensible programming language type}} {{redir|PPL (programming language)|the Hewlett-Packard calculator language|HP PPL}} The '''Polymorphic Programming Language''' ('''PPL''') was developed in 1969 at Harvard University by Thomas A. Standish. It is an interactive, extensible language with a base language similar to the language APL.<ref>{{cite journal |last=Standish |first=Thomas A. |date=August 1969 |editor1-last=Christensen |editor2-last=Shaw |title=Some features of PPL – a Polymorphic Programming Language |url=http://portal.acm.org/citation.cfm?id=1115858.1115864&coll=GUIDE&dl=GUIDE |volume=4 |issue=8 |pages=20–26 |doi=10.1145/1115858.1115864 |access-date=2018-06-23 |journal=ACM SIGPLAN Notices |language=en |edition=Proceedings of Extensible Language Symposium |location=ACM Digital Library |publisher=Association for Computing Machinery|url-access=subscription }}</ref>

The assignment operator <code>&lt;-</code> (or <code>←</code>) has influenced the language S.<ref>{{cite web |url=http://cm.bell-labs.com/cm/ms/departments/sia/doc/96.7.ps |archive-url=https://web.archive.org/web/20070409042926/http://cm.bell-labs.com/cm/ms/departments/sia/doc/96.7.ps |url-status=dead |archive-date=2007-04-09 |title=Evolution of the S Language |last=Chambers |first=John M. |author-link=John Chambers (programmer) |date=November 1994 |access-date=2009-05-06 |format=PostScript}}</ref>

== References == {{Reflist}}

{{APL programming language}}

Category:Procedural programming languages Category:Harvard University Category:Programming languages created in 1969

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