CLU - Programming language

CLU is a programming language created in 1975 by Barbara Liskov.

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49Years Old

CLU is a programming language created at the Massachusetts Institute of Technology (MIT) by Barbara Liskov and her students between 1974 and 1975. While it did not find extensive use, it introduced many features that are used widely now, and is seen as a step in the development of object-oriented programming (OOP). Key contributions include abstract data types, call-by-sharing, iterators, multiple return values (a form of parallel assignment), type-safe parameterized types, and type-safe variant types. Read more on Wikipedia...

Tags: programming language
Early development of CLU happened in MIT
CLU on HOPL
CLU appears in the TIOBE Index
See also: (17 related languages) SPARC, ALGOL 60, Lisp, Simula, Ada, Argus, Lua, Ruby, Sather, Swift, Algol, ML, CPL, Java, Python, C#, Perl

Example from hello-world:

start_up = proc ()
    po: stream := stream$primary_output ()
    stream$putl (po, "Hello World")
    end start_up

Example from Wikipedia:

complex_number = cluster is add, subtract, multiply, ...
        rep = record [ real_part: real, imag_part: real ]
        add = proc ... end add;
        subtract = proc ... end subtract;
        multiply = proc ... end multiply;
        ...
    end complex_number;

Language features

Feature	Supported	Example	Token
Strings	✓	"Hello world"	"
Print() Debugging	✓		stream$putl