Dear Unicon-group,
The following message came in on the list from an effectively anonymized
source, but the questions are fun. What answers would you give?
Cheers,
Clint
=================original message follows===================
Why doesn't this work:
altern:=create(1 to 9)
every (@altern) do {...}
as in (pseudocode!):
altern:="(1 to 9)"
every EVAL(altern) do {..} ### delayed EVALuation
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
BTW, check out:
procedure curly(a,b)
local N
if type(a)=="list" then {
N:= copy(a)
if type(N[1])=="co-expression" then {a:=@(N[1])}
if type(N[2])=="co-expression" then {b:=@(N[2])}
}
write(a,"_",b)
end
------------------------------------------------------
You can call this procedure with either
curly("suc","cess")
or...
curly{"SUC","CESS"} ### Note the COMMA separator !!!!
------------------------------------------------------
It seems the CURLY brackets were intended to make "argument-
evaluation" before a call "BackTrack-safe".
However, you can't call EVERY, WHILE and UNTIL in the same way as the CURLY
procedure above. Apparently you must use SEMICOLONS instead of commas:
while{... ; ... ; ... } do {...}
================================================
Thanks!
Bob
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