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 <[email protected]>
> 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
>
> ----------------------------------------------------------------------
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>
--
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Fornustekkum II
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