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    Some corrections:

    • AbDTs are from CLU, not simula 67.
    • While simula 67 introduced objects, certain qualities of OOP first appeared with Smalltalk-72.
    • PL/I had overloading before Algol 68.

    And a few I’m less sure of:

    • References first appeared in CPL, not Algol 68.
    • PL/I had user defined datatypes before Algol 68.
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      COMTRAN (1960, see e.g. page 103) pretty much had user-defined datatypes which were adopted into COBOL and then PL/I picked up things from there. There’s probably still a predecessor to that, though!

      FLOW-MATIC maybe sorta did but the DDL is pretty obtuse (but the FLOW-MATIC manual is really nice).

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        Deleted (replied to the incorrect comment)

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          While simula 67 introduced objects, certain qualities of OOP first appeared with Smalltalk-72

          Which qualities?

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            Treating primitives as objects is the big one. In Simula, the number 26 is a primitive, not an object.

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              I contend that “everything is an object” is not a “quality” of OOP. Are Java, C# or C++ limited in terms of object-oriented programming by not doing so?

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                They certainly are, since the distinction between an “object” and a “primitive” is an artificial one, made for the compiler implementer’s sake rather than the user’s.

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                  You’re right and I’m wrong.

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              I’d be interested in:

              • coroutines
              • pipes (shell)
              • interfaces
              • scoped init and destroy (C++, Python with, shell redirects have this flavor)
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                Some links don’t work:

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                  Recursion should be on this list. Lisp is considered the first language to have supported it, according to McCarthy’s History of Lisp: http://www-formal.stanford.edu/jmc/history/lisp/lisp.html

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                    I think that’s true. Recursion was a contentious subject in the ALGOL conference, and I think it was McCarthy and some of the European committee members who insisted on it, whereas Backus thought it superfluous.