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Ingy döt Net 2013-04-10 22:43:41 -07:00
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Task/Function-composition/REBOL/function-composition-1.rebol Normal file
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REBOL [
Title: "Functional Composition"
Author: oofoe
Date: 2009-12-06
URL: http://rosettacode.org/wiki/Functional_Composition
]
; "compose" means something else in REBOL, therefore I use a 'compose-functions name.
compose-functions: func [
{compose the given functions F and G}
f [any-function!]
g [any-function!]
] [
func [x] compose [(:f) (:g) x]
]

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Task/Function-composition/REBOL/function-composition-2.rebol Normal file
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foo: func [x] [reform ["foo:" x]]
bar: func [x] [reform ["bar:" x]]
foo-bar: compose-functions :foo :bar
print ["Composition of foo and bar:" mold foo-bar "test"]
sin-asin: compose-functions :sine :arcsine
print [crlf "Composition of sine and arcsine:" sin-asin 0.5]