Hi, David...
[EMAIL PROTECTED] wrote:
>
> Can someone please explain why the first result is word instead
> of logic...
>
> >> b: ["John" true "Sam" false]
> == ["John" true "Sam" false]
> >> print type? second b
> word
Because 'true and 'false are not literal logic values, but rather are
simply words predefined to refer to logic values (fortunately, the
ones you would expect ;-). The words 'yes and 'no, as well as
'on and 'off, are likewise predefined.
For more details, see the values/logic section of the new manual, at:
http://www.rebol.com/manual/vallogic.html
>
> and why the second prints anything at all?
>
> >> if fourth b [print "OK"]
> OK
>
The convention is that if an expression evaluates to 'none, then it
is treated as false; otherwise it is treated as true. The fourth
element of the block referenced by 'b exists, and is a word.
Therefore it behaves as if true.
SUGGESTION:
To get what you seem to be looking for, try 'do on the word/value
that you pull from the block.
>> c: [true false on off yes no]
== [true false on off yes no]
>> foreach thingy c [
[ print [thingy "^-" to-logic thingy "^-" do thingy]
[ ]
true true true
false true false
on true true
off true false
yes true true
no true false
-jn-
