Scheme Requests For Implementation
Because of Scheme's minimalism, many common procedures and syntactic forms are not defined by the standard. In order to keep the core language small but facilitate standardization of extensions, the Scheme community has a "Scheme Request for Implementation" (SRFI) process by which extension libraries are defined through careful discussion of extension proposals. This promotes code portability. Many of the SRFIs are supported by all or most Scheme implementations.
SRFIs with fairly wide support in different implementations include:
- 0: feature-based conditional expansion construct
- 1: list library
- 4: homogeneous numeric vector datatypes
- 6: basic string ports
- 8: receive, binding to multiple values
- 9: defining record types
- 13: string library
- 14: character-set library
- 16: syntax for procedures of variable arity
- 17: generalized set!
- 18: Multithreading support
- 19: time data types and procedures
- 25: multi-dimensional array primitives
- 26: notation for specializing parameters without currying
- 27: sources of random bits
- 28: basic format strings
- 29: localization
- 30: nested multi-line comments
- 31: a special form for recursive evaluation
- 37: args-fold: a program argument processor
- 39: parameter objects
- 41: streams
- 42: eager comprehensions
- 43: vector library
- 45: primitives for expressing iterative lazy algorithms
- 60: integers as bits
- 61: a more general cond clause
- 66: octet vectors
- 67: compare procedures
A full list of accepted (finalized) SRFIs is available at http://srfi.schemers.org/final-srfis.html
Read more about this topic: Scheme (programming Language)
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