what jacob already suggested as a working solution captures = ismatch(regex,str) ? match(regex, str).captures : return
i can live with that but i would like to express this without the ismatch but still in a single line Am Dienstag, 21. Oktober 2014 21:41:35 UTC+2 schrieb Stefan Karpinski: > > What do you want your original example to do? > > On Oct 21, 2014, at 3:39 PM, Till Ehrengruber <[email protected] > <javascript:>> wrote: > > ah i see. I'm a bit confused about conditionals since > > false || nothing > > for example works alright but > > nothing || false > > does not. Since the last one doesn't work like I expected my question is > pretty senseless ^^ But still i like the used syntax as this doesn't need > another function (like the `ismatch`) which can be pretty nasty to > implement when the computation is havy and you want to cache the result. Is > there any specific reason that conditionals aren't "symmetric"? > > Can't see the benefit of the nullable type in this case can you tell? > > Am Dienstag, 21. Oktober 2014 14:39:12 UTC+2 schrieb Jacob Quinn: >> >> Not sure what you’re asking here: do you have a case where you can’t use >> a return within an expression? One thing to note with your example above is >> that only boolean values can be used in conditionals (i.e. if-statements, >> && and || operators, etc.), match returns the match contents if there >> was a match, and the nothing value otherwise. So to make your case work, >> you’d need something like: >> >> captures = ismatch(regex,str) ? match(regex, str).captures : return >> >> In Julia 0.4 dev branch, a Nullable type was recently merged and it’s >> been discussed using a Nullable as the return type of regex operations >> which would make it slightly easier to check for non-matches. >> >> -Jacob >> >> >> On Tue, Oct 21, 2014 at 3:52 AM, Till Ehrengruber <[email protected]> >> wrote: >> >>> wouldn't it be nice to be able to use the return statement deep inside >>> your expression such that something like >>> >>> captures = (match(regex, str) || return).captures >>> >>> in this specific case i encountered a simple HttpRouter which just skips >>> the current handler and i don't really need the other results of the match >>> expression >>> >>> regards till >>> >> >>
