It's very handy, but a cognitive hurdle for me at first. I'd never seen
anything like it before.
Anyone else have a mental hiccup when they first encountered this?
Absolutely! Which is why there's couple of tips about this at my site:
I believe I discovered that this custom sort function has to be
modified in one tiny way to work properly. Instead of
sort lines of fld 1 by valueList(word 1 of each)
you have to do
sort lines of fld 1 numeric by valueList(word 1 of each)
The valueList function returns a number, so the sort
J. Landman Gay wrote:
But wait, there's more! Some time ago when the list was discussing
custom parallel sorts, Dick Kriesel offered this enhancement:
split varB by comma
sort items of varA by varB[itemOffset(each,varA)]
If Dick's still reading the list, he should stand up and take a bow.
A good point, Peter. It would not affect the example as only 7 day-values
are involved, but longer value lists would indeed be affected.
on mouseUp
sort lines of fld 1 numeric by valueList(word 1 of each)
end mouseUp
function valueList what
put
This is very elegant. With a little more tweaking, you could use it to
choose any of more than 2 values! Now in the Scripter's Scrapbook.
Thank you, Jacque.
/H
J. Landman Gay wrote:
function whichOne var,fld1,fld2 -- from a handler by Tony Root
-- Handles a case where you need to return one
Hugh Senior wrote:
Have you needed to sort lists by a value list or synchronize different
lists, but thought it not easily do-able in Rev? You may find the following
tips useful.
In a field, type some lines where the first word is a random day of the
week, then...
on mouseUp
sort lines
Richard Gaskin wrote:
Hugh Senior wrote:
Have you needed to sort lists by a value list or synchronize different
lists, but thought it not easily do-able in Rev? You may find the
following tips useful.
In a field, type some lines where the first word is a random day of
the week, then...
on
Richard, if you look at the 'valueList' function, it returns a number
ie. the offset of a weekday name into the list of weekday names. It's
this value that is being used to sort the list. It's like attaching a
temporary value to each line and sorting by that.
If there were more than 9
On 6/17/08 2:49 PM, Richard Gaskin [EMAIL PROTECTED] wrote:
full text of the question appears below
I've never before seen a sort where the sort specifier is a literal
value. :\
What exactly does that do, and how does it do it?
And where did you learn how do that? I can't find anything in
J. Landman Gay wrote:
Richard Gaskin wrote: on mouseUp
on mouseUp
sort lines of fld 1 by valueList(word 1 of each)
end mouseUp
function valueList what
put Monday,Tuesday,Wednesday,Thursday,Friday,Saturday,Sunday
into tList
return itemOffset(what,tList)
end valueList
If I
On 17 Jun 2008, at 23:57, Richard Gaskin wrote:
But I guess I'm stuck on the old (outdated?) notion that functions
are evaluated before their result is used in the calling command,
which would mean the calling sort command is effectively using:
sort lines of fld 1 by 1
Except that
Mark Smith wrote the magic phrase that made this much clearer to me:
It's like attaching a temporary value to each line and sorting
by that.
The moment of a ha! Thank you, Mark. Jim Ault's detailed explanation
was also helpful.
So this tells me two things:
1. Using a function for a
Richard Gaskin wrote:
But I guess I'm stuck on the old (outdated?) notion that functions are
evaluated before their result is used in the calling command,
It's still doing that. The function is evaluated first, before the sort
assigns it a position. The difference here is that each is
Richard Gaskin wrote:
1. Using a function for a sortKey expression introduces a sometimes
rule in terms of understanding the order of expression evaluation in the
engine, in which most of the time functions are evaluated first but in
this case the function is applied repeatedly for each line
Richard Gaskin wrote:
So this tells me two things:
1. Using a function for a sortKey expression introduces a sometimes
rule in terms of understanding the order of expression evaluation in the
engine, in which most of the time functions are evaluated first but in
this case the function is
J. Landman Gay wrote:
Richard Gaskin wrote:
1. Using a function for a sortKey expression introduces a sometimes
rule in terms of understanding the order of expression evaluation in the
engine, in which most of the time functions are evaluated first but in
this case the function is applied
Richard Gaskin wrote:
It's very handy, but a cognitive hurdle for me at first. I'd never seen
anything like it before.
You probably blocked it. :)
http://search.gmane.org/?query=custom+sortgroup=gmane.comp.ide.revolution.user
Anyone else have a mental hiccup when they first encountered
J. Landman Gay wrote:
Richard Gaskin wrote:
It's very handy, but a cognitive hurdle for me at first. I'd never seen
anything like it before.
You probably blocked it. :)
http://search.gmane.org/?query=custom+sortgroup=gmane.comp.ide.revolution.user
Wow. So many posts I've overlooked.
Richard Gaskin wrote:
In other languages that's called iff.
Whoa, I didn't know there was a name for it. Makes sense, since Tony
came to HyperCard from other languages. So he was probably translating.
Paul's/Tony's implementation is
very clever, but I believe it benchmarks a bit faster
From: Richard Gaskin [EMAIL PROTECTED]
But I guess I'm stuck on the old (outdated?) notion that functions are
evaluated before their result is used in the calling command
The AHA moment for me was some time ago when Jacque shared the
beautiful line to shuffle something:
sort something by
But wait, there's more! Some time ago when the list was discussing
custom parallel sorts, Dick Kriesel offered this enhancement:
split varB by comma
sort items of varA by varB[itemOffset(each,varA)]
If Dick's still reading the list, he should stand up and take a bow.
--
Jacqueline Landman
Have you needed to sort lists by a value list or synchronize different
lists, but thought it not easily do-able in Rev? You may find the following
tips useful.
In a field, type some lines where the first word is a random day of the
week, then...
on mouseUp
sort lines of fld 1 by
Thanks Hugh! This is quite cool.
Phil Davis
Hugh Senior wrote:
Have you needed to sort lists by a value list or synchronize different
lists, but thought it not easily do-able in Rev? You may find the
following tips useful.
In a field, type some lines where the first word is a random day of
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