Chez Scheme is a programming language, a dialect and implementation of the language

Scheme A scheme is a systematic plan for the implementation of a certain idea. Scheme or schemer may refer to: Arts and entertainment * ''The Scheme'' (TV series), a BBC Scotland documentary series * The Scheme (band), an English pop band * ''The Schem ...

which is a type of

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. It uses an incremental native-code compiler to produce native binary files for the x86 ( IA-32, x86-64),

PowerPC PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., App ...

, and SPARC processor architectures. It has supported the R6RS standard since version 7.9.1. It is

free and open-source software Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software where anyone is freely licensed to use, copy, study, and change the software in any way, and the source ...

released under an Apache License, version 2.0. It was first released in 1985, by R. Kent Dybvig, originally licensed as proprietary software, and then released as open-source software on GitHub on 2016-05-13 with version 9.4. Petite Chez Scheme is a sibling implementation which uses a threaded interpreter design instead of Chez Scheme's incremental native-code compiler. Programs written for Chez Scheme run unchanged in Petite Chez Scheme, as long as they do not depend on using the compiler (for example foreign function interface is only available in the compiler). Petite Chez Scheme was originally freely distributable and is now distributed open-source as part of Chez Scheme.

History

The first version of Chez Scheme was developed by R. Kent Dybvig and completed in 1984. Some copies of the original version were distributed in 1985. Cadence Research Systems developed Chez Scheme until the company was purchased by Cisco Systems in 2011. Cisco open-sourced Chez Scheme in 2016.

Performance

In one series of benchmarks, Chez Scheme was among the fastest available Scheme implementations on the Sun SPARC processor architecture, while Petite Chez Scheme was among the slowest implementations on the more common x86 ( Pentium 32-bit) processor architecture.

Libraries

Chez Scheme has a windowing system and computer graphics package called the Scheme Widget Library, and is supported by the portable SLIB library.. However the widget library is no longer maintained.

References

External links

*
The Development of Chez Scheme
by R. Kent Dybvig *
Chez Scheme formal project page on GitHub
*
Chez Scheme on the Scheme wiki
Formerly proprietary software Scheme (programming language) compilers Scheme (programming language) interpreters Scheme (programming language) implementations Software using the Apache license R6RS Scheme {{Compu-prog-stub