[Jprogramming] verb to template a string

['Pascal Jasmin' via Programming]

silly example version and flexible to unboxed numeric and string Y


maybenum =: 0&".^:(] -:&(, $~ 1 -.~ $) ":@:(0&".^:(2 = 3!:0)))
ApplyTemplate=. ('`' maybenum each@:(cut^:(0 = L.@])) [) ;@:({:: ::[L:0 _) ":each@:(<^:(2=3!:0))@]

Y =: (&({::))(@:])

'0` bottles of beer on the wall. `0` bottles of beer. You take `1` down, pass the `1` around, `2` bottles of beer on the wall.' ApplyTemplate("1)   1 1 0 ,~ ((2 Y - 1 Y  ),~ 1 Y ,~ 0 Y - 1 Y )^:(0 < 1 Y)^:(<49)  (] , -/)99 2



----- Original Message -----
From: 'Pascal Jasmin' via Programming <programming at jsoftware.com>
To: "programming at jsoftware.com" <programming at jsoftware.com>
Sent: Thursday, January 7, 2016 12:06 PM
Subject: Re: [Jprogramming] verb to template a string

less typy version :)


maybenum =: 0&".^:(] -:&(, $~ 1 -.~ $) ":@:(0&".^:(2 = 3!:0)))


ApplyTemplate=. ('`' maybenum each@:(cut^:(0 = L.@])) [) ;@:({:: ::[L:0 _) ]

   'Hello `0` world! `1' ApplyTemplate (;:'abc de')
Hello abc world! de

still works with typy version:

    ('Hello ';0;' world! ';1) ApplyTemplate (;:'abc de')
Hello abc world! de

----- Original Message -----
From: Jose Mario Quintana <jose.mario.quintana at gmail.com>
To: Programming forum <programming at jsoftware.com>
Sent: Thursday, January 7, 2016 11:46 AM
Subject: Re: [Jprogramming] verb to template a string

Joe,

This (or something similar) might be sufficient depending on what you are
really trying to accomplish:

ApplyTemplate=. [ ;@:({:: ::[L:0 _) ,@:]

  ('Hello ';0;' world! ';0) ApplyTemplate (<'abc')
Hello abc world! abc
  ('Hello ';0;' world! ';1) ApplyTemplate (;:'abc de')
Hello abc world! de


On Thu, Jan 7, 2016 at 11:16 AM, Raul Miller <rauldmiller at gmail.com> wrote:

> On Thu, Jan 7, 2016 at 9:49 AM, Joe Bogner <joebogner at gmail.com> wrote:
> > I think the concept of applyTemplate is useful because joining strings
> > can be tedious when J evaluates them as a train (] , ' foo')  -- no
> > noun allowed in the right tine! and that can get trippy with longer
> > strings:
> >
> > ('Dear', ] , ' - Hello!') 'abc'  -- nope!
> >
> > ('Dear ', ] @ ,&' - Hello!') 'abc' -- typically a trial and error and
> > not as easily red
> >
> >    ('Dear ';0;' - Hello!') applyTemplate ('abc';'')
> > Dear abc - Hello!
>
> That particular issue can be resolved using an appropriate bit of
> nothing to anchor the train.
>
>    mt1=:''"_
>    ('Dear ', ] , ' - Hello!',mt1) 'abc'
> Dear abc - Hello!
>
> The 1 in the name refers to the rank of the empty value it supplies.
> In some cases you would want a rank 2 value.
>
> And of course, the consequence is that you can use J's trains as
> "templates" containing verbs. Whether or not that's appropriate will
> depend on what you are doing - there still might be contexts where
> boxed index/string combos are the right answer. But in a lot of the
> cases something simpler will do. (This seems to be the case so very
> often, though there can also be good reasons to use other
> approaches...).
>
> FYI,
>
> --
> Raul
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm


>
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