Hi Gerard,
Look at this:
a: 1
;== 1
a ; you type a word
;== 1 ; it is evaluated and result returned
'a ; you type a lit-word
;== a ; it is evaluated and result returned (a word)
to-lit-word 'a ; you type a lit-word, it is evaluated to a word
;== 'a ; but then you converted it back to a lit-word
So, in your MY-MAP function below, the 'first lit-word
is converted to a word *before* it is passed to the function.
The solution is to have MY-MAP accept f as a word!, eg:
my-map: func [f [word!] ...
Anton.
> Being so I tried to add more validation for parameters f and blk
> as in f [lit-word!] and blk [block!]. To my great surprise I
> received the following error msg. Can someone help me to better
> understand how REBOL can send me this error ?
>
> Why is 'first not considered as a real lit-word! datatype! ?
>
> >> my-map: func [f [lit-word!] blk [block!] /local result] [
> [ result: make block! length? blk
> [ foreach item blk [
> [ append/only result do reduce [:f :item]
> [ ]
> [ result
> [ ]
> >> my-map 'first ["ab" "cd" "ef"]
> ** Script Error: my-map expected f argument of type: lit-word
> ** Where: halt-view
> ** Near: my-map 'first ["ab" "cd" "ef"]
> >>
>
> Thanks!
> Regards,
> Gerard
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