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In the R5RS standard and also in later reports, the syntax of Scheme can easily be extended via the macro system. The R5RS standard introduced a powerful hygienic macro system that allows the programmer to add new syntactic constructs to the language using a simple pattern matching sublanguage (R5RS sec 4.3). [4]
SISC is an R5RS Scheme implementation, which includes a full number tower, hygienic macros, proper tail recursion, and first class continuations.SISC is short for Second Interpreter of Scheme Code, in reference to its predecessor LISC, the Lightweight Interpreter of Scheme Code.
Chicken's focus is quickly clear from its slogan: "A practical and portable Scheme system". Chicken's main focus is the practical application of Scheme for writing real-world software. Scheme is well known for its use in computer science curricula and programming language experimentation, but it has seen little use in business and industry. [3]
The Scheme language is standardized in the official Institute of Electrical and Electronics Engineers (IEEE) standard, [17] and a de facto standard called the Revised n Report on the Algorithmic Language Scheme (RnRS). The most widely implemented standard is R5RS (1998), [18] and a new standard, R6RS, [19] was ratified in 2007. [20]
Mostly based on Scheme and Common Lisp, was designed as system and application programming language by Apple; first used to write an operating system and applications for internal prototypes of the later released Apple Newton computer; first official version of Apple Dylan also had s-expression based syntax; Apple collaborated with partners to ...
Further, the language features the first contract system for a higher-order programming language. [44] Racket's contract system is inspired by the Design by Contract work for Eiffel and extends it to work for higher-order values such as first-class functions, objects, reference cells, and so on. For example, an object that is checked by a ...
At the time, no standard macro system was adopted by Scheme implementations. Shortly thereafter in '87, Kohlbecker and Wand proposed a declarative pattern-based language for writing macros, which was the predecessor to the syntax-rules macro facility adopted by the R5RS standard.
It is written in the language C, by Aubrey Jaffer, the author of the SLIB Scheme library and the JACAL interactive computer algebra (symbolic mathematics) program. It conforms to the standards R4RS, R5RS, and IEEE P1178. It is free and open-source software released under a GNU Lesser General Public License (LGPL). [1]