[REBOL] Re: Trace function
From: joel:neely:fedex at: 22-Jun-2001 1:49
Hi, Christophe,
CRS - Psy Sel/SPO, COUSSEMENT, Christophe, CPN
wrote:
> [My experiences on that field are similar to those of Joel.
> - BTW I don't know *MAP* what does it means ?-
>
We've kicked around several variations on the MAP theme,
here's one...
map: function [
{Maps a function to all elements of a block}
[throw]
f [any-function!]
blk [block!]
] [result] [
result: make block! length? blk
foreach elem blk [
insert/only tail :result f get/any 'elem
]
result
]
...from the collection of functions Ladislav
published on his web site:
http://www.sweb.cz/LMecir/highfun.r
MAP applies an argument function to all elements of a block
and returns the block of results, as in
>> square: func [x] [x * x]
>> map :square [1 2 3 4 5]
== [1 4 9 16 25]
>> map :positive? [1 -2 3 -4 5 -6]
== [true false true false true false]
>> map :random [2 2 6 6 52 52]
== [2 1 2 1 11 10]
HTH!
-jn-
------------------------------------------------------------
Programming languages: compact, powerful, simple ...
Pick any two!
joel'dot'neely'at'fedex'dot'com
