[REBOL] Re: [FIND] [FoxPro] Re: Find? Copy/Part?
From: sqlab:gmx at: 19-Jan-2005 15:56
Hello
Can someone tell me why I get different results for n = 0
with these two variants?
find-nth0: func [
"Returns the series after the Nth occurrence of value or none."
series [series!]
value
N [integer!]
/local pos
] [
parse series [n [thru value] pos: to end]
pos
]
find-nth1: func [
"Returns the series after the Nth occurrence of value or none."
series [series!]
value
N [integer!]
/local pos
] [
parse series [n thru value pos: to end]
pos
]
>> find-nth1 "0**3*4" "*" 0
== none
>> find-nth0 "0**3*4" "*" 0
== "0**3*4"
>>
Or with other questions;
why is zero times [..] true
and zero times .. false?
Other n's give the same result
>> find-nth1 "0**3*4" "*" 3
== "4"
>> find-nth0 "0**3*4" "*" 3
== "4"
AR
>
> Andreas Bolka napsal(a):
>
> >Wednesday, January 19, 2005, 12:23:28 PM, Gabriele wrote:
> >
> >
> >
> >>so you'd need to check PARSE's result and return NONE if it didn't
> >>match.
> >>
> >>
> >
> >and so that this exercise is not left to the reader:
> >
> > find-nth: func [
> > "Returns the series at occurrence N of value or none."
> > series [series!]
> > value
> > n [integer!]
> > /local pos
> > ] [
> > either parse series [n [to value pos: value] to end] [pos] [none]
> > ]
> >
> >
> >
> I sent my correction
>
> find-nth: func [
> "Returns the series at occurrence N of value or none."
> series [series!]
> value
> n [integer!]
> /local pos
> ] [
> if parse series [n [to value pos: value] to end] [pos]
> ]
>
> immediately, but it didn't make it to the list yet :-(
>
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