The map function
[1/4] from: sharriff::aina::med-iq::de at: 8-Nov-2000 8:12
Hi Andrew!
USAGE:
MAP Arg1 Arg2 /Only
DESCRIPTION:
Maps a function to all elements of a block.
MAP is a function value.
ARGUMENTS:
Arg1 -- (Type: any-function block)
Arg2 -- (Type: any-function block)
REFINEMENTS:
/Only -- Inserts the result of the function as a series.
(SPECIAL ATTRIBUTES)
throw
catch
>> adder: func [ a b ] [ a + b ]
>> testblock: [ "element1" "element2" ]
== ["element1" "element2"]
>> map testblock adder
** Script Error: adder is missing its a argument.
** Where: map testblock adder
>> printer: does [print "ho"]
>> printer
ho
>> map [testblock] printer
ho
** Script Error: map expected Arg2 argument of type: any-function block.
** Where: map [testblock] printer
>> map [testblock] [printer]
** Script Error: Cannot use "Map block!" on "block!" value.
** Where: map [testblock] [printer]
>> map testblock [printer]
** Script Error: Cannot use "Map block!" on "block!" value.
** Where: map testblock [printer]
>>
According to the MAP help, it takes the types any-function block or block?
what am I doing wrong?
Sharriff Aina
med.iq information & quality in healthcare AG
www.med-iq.de
[2/4] from: petr:krenzelok:trz:cz at: 8-Nov-2000 9:32
[Sharriff--Aina--med-iq--de] wrote:
> Hi Andrew!
> USAGE:
<<quoted lines omitted: 32>>
> According to the MAP help, it takes the types any-function block or block?
> what am I doing wrong?
map imho uses only ONE item thru each iteration, so doing a + b imho will not
work (I never looked at map source thought :-)
and so you can't do a + b upon "just-some-string" ... but maybe I am wrong ...
-pekr-
[3/4] from: al:bri:xtra at: 8-Nov-2000 22:48
Sharriff wrote:
> According to the MAP help, it takes the types any-function block or block?
what am I doing wrong?
>> f: func [a] [join a " hello"]
>> f 3
== "3 hello"
>> type? :f
== function!
>> type? f
** Script Error: f is missing its a argument.
** Where: type? f
>> map [1 2 3] :f
== ["1 hello" "2 hello" "3 hello"]
>> map :f ["Andrew says"]
== ["Andrew says hello"]
Note the ":", colon or "snake-bite".
Andrew Martin
Swanning about...
ICQ: 26227169
http://members.nbci.com/AndrewMartin/
[4/4] from: al:bri:xtra at: 8-Nov-2000 22:59
> >> adder: func [ a b ] [ a + b ]
> >> testblock: [ "element1" "element2" ]
<<quoted lines omitted: 3>>
> ** Where: map testblock adder
>> accumulate 0 [1 2 3 4] func [a v] [a + v]
== 10
Seems more appropriate.
Andrew Martin
Accumulating Zzzzzz...
ICQ: 26227169
http://members.nbci.com/AndrewMartin/
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