Polymorphic Programming Language

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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 APL.

The '<-' (or '') assignment operator has played an influence in the S programming language.[1]


  1. ^ Chambers, John M. (November 1994), Evolution of the S Language (PostScript), retrieved 2009-05-06