Procedural languages that raise the level of abstraction well above the machine by building powerful data types into the language. Icon is a very high-level language based on goal-directed execution, in which an expression may produce a result or fail and the language backtracks, and SETL is a very high-level language based on the mathematical theory of sets, where programs manipulate whole sets as ordinary values. Both came from research settings in the 1960s and 1970s.
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Very High-Level Languages
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Icon (programming language) (Wikipedia)
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Icon is a very high-level programming language based on the concept of "goal-directed execution" in which an expression in code returns "success" along with a result, or a "failure", indicating that there is no valid result.
SETL (Wikipedia)
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SETL (SET Language) is a very high-level programming language based on the mathematical theory of sets.
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