cyclone/docs/api/scheme/cxr.md
2016-10-04 00:18:21 -04:00

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# CxR Library
The `(scheme cxr)` library exports twenty-four procedures which are the compositions of from three to four `car` and `cdr` operations. For example `caddar` is defined by:
(define caddar
(lambda (x) (car (cdr (cdr (car x))))))
The procedures `car` and `cdr` themselves and the four two-level compositions are included in the base library.
For more information see the [R<sup>7</sup>RS Scheme Specification](../../r7rs.pdf).
- [`caaar`](#caaar)
- [`caadr`](#caadr)
- [`cadar`](#cadar)
- [`caddr`](#caddr)
- [`cdaar`](#cdaar)
- [`cdadr`](#cdadr)
- [`cddar`](#cddar)
- [`cdddr`](#cdddr)
- [`caaaar`](#caaaar)
- [`caaadr`](#caaadr)
- [`caadar`](#caadar)
- [`caaddr`](#caaddr)
- [`cadaar`](#cadaar)
- [`cadadr`](#cadadr)
- [`caddar`](#caddar)
- [`cadddr`](#cadddr)
- [`cdaaar`](#cdaaar)
- [`cdaadr`](#cdaadr)
- [`cdadar`](#cdadar)
- [`cdaddr`](#cdaddr)
- [`cddaar`](#cddaar)
- [`cddadr`](#cddadr)
- [`cdddar`](#cdddar)
- [`cddddr`](#cddddr)
# caaar
(caaar list)
# caadr
(caadr list)
# cadar
(cadar list)
# caddr
(caddr list)
# cdaar
(cdaar list)
# cdadr
(cdadr list)
# cddar
(cddar list)
# cdddr
(cdddr list)
# caaaar
(caaaar list)
# caaadr
(caaadr list)
# caadar
(caadar list)
# caaddr
(caaddr list)
# cadaar
(cadaar list)
# cadadr
(cadadr list)
# caddar
(caddar list)
# cadddr
(cadddr list)
# cdaaar
(cdaaar list)
# cdaadr
(cdaadr list)
# cdadar
(cdadar list)
# cdaddr
(cdaddr list)
# cddaar
(cddaar list)
# cddadr
(cddadr list)
# cdddar
(cdddar list)
# cddddr
(cddddr list)