Polymorphic Programming Language

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.[1]

The assignment operator <- (or ) has influenced the language S.[2]


  1. Standish, Thomas A. (August 1969). Christensen; Shaw (eds.). "Some features of PPL – a Polymorphic Programming Language". ACM SIGPLAN Notices (Proceedings of Extensible Language Symposium ed.). ACM Digital Library: Association for Computing Machinery. 4 (8): 20–26. doi:10.1145/1115858.1115864. Retrieved 2018-06-23.
  2. Chambers, John M. (November 1994). "Evolution of the S Language" (PostScript). Retrieved 2009-05-06.
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