You can use the colon like this
    foo=:- : -

     foo 3
_3

     5 foo 3
2

In a way it is the same as
     foo=:-

     foo 3
_3

     5 foo 3
2

To show that the colon makes a difference
     foo=:- : +

     foo 3
_3

     5 foo 3
8

2010/8/17 Graham Parkhouse <graham.parkho...@ntlworld.com>

> Both JfC and LJ mention a 'solo colon' separating the monadic from the
> dyadic cases of an explicit verb. Unaware of this, I got caught out
> recently
> by adding a comment after the colon. J doesn't like it!
>
>   foo=: 3 : 0
> -y
> :
> x-y
> )
>   foo 3
> _3
>   5 foo 3
> 2
>
> 0K! But ...
>
>   foo=: 3 : 0
> -y
> :    NB. No comments allowed on this line!
> x-y
> )
>
>   foo 3
> |value error: x
> |       x-y
>   5 foo 3
> |domain error: foo
> |   5     foo 3
>
> It appears that the colon should be oh so solo!
>
> Regards
>
> Graham
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>



-- 
Björn Helgason, Verkfræðingur
Fornustekkum II
781 Hornafirði,
t-póst: gos...@gmail.com
gsm: +3546985532
sími: +3544781286
http://groups.google.com/group/J-Programming


Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans

góður kennari getur stigið á tær án þess að glansinn fari af skónum
          /|_      .-----------------------------------.
         ,'  .\  /  | Með léttri lund verður        |
     ,--'    _,'   | Dagurinn í dag                     |
    /       /       | Enn betri en gærdagurinn  |
   (   -.  |        `-----------------------------------'
   |     ) |         (\_ _/)
  (`-.  '--.)       (='.'=)   ♖♘♗♕♔♙
   `. )----'        (")_(") ☃☠
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm

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