Hi! No, list context is more common. In particular, it isn’t the comma operator. It’s (I think) the parenthesis.
`(123, 456)` creates a list of two elements. Lists no longer automatically flatten (i.e., (1, (2, 3), 4) is only three elements long). If there is a space after a function call, it’s assumed to be a list operator, not a function, so the parameters are interpreted in list context; this means that (123, 456) creates a single list object which gets passed to your function. Ricky > On Feb 17, 2016, at 4:26 PM, Greg London <[email protected]> wrote: > > > So perl6 thinks it is an expression, > With some kind of weird "comma" operator, > Which returns a single thingy of some kind, > That gets passed as a single argument to the function? > > What is the comma operator doing > And what is the return thingy of the expression? > > In perl5, this would have been at most list context of 123 and 455, which > would have returned multiple items in a list, and would be visible in > A perl 5 sub as $_[0] and $_[1]. > > Is list context gone in perl 6? > > > Greg > > > > On Wed, February 17, 2016 11:04 am, Bill Ricker wrote: >> That's an ambiguous parse for 1 arg vs 2 arg form, are the parents a >> function call or an expression. Space disambiguates it: f( a, a2) is >> function, f (a, a2) is an expression whose result is passed to the >> function. >> >> On Wed, Feb 17, 2016 at 11:43 AM, Greg London <[email protected]> >> wrote: >> >> >>> >>> Is perl6 whitespace sensitive? >>> Or is this a bug? >>> >>> >>> I have a multi() for 1 and 2 artuments >>> But a 2 arg call ends up getting into the wrong sub >>> Apparently because there is a space between the sub name and the >>> Opening parenthesis? >>> >>> >>> >>> >>> multi mysub($arg1) { say "mysub(one): $arg1"; } >>> >>> >>> multi mysub($arg1, $arg2) { say "mysub(two): '$arg1' then '$arg2'"; } >>> >>> >>> >>> >>> mysub(555); mysub(123, 456); mysub(999); mysub (123, 456); # a space >>> between sub and parenthesis >>> >>> output: >>> >>> >>> mysub(one): 555 >>> mysub(two): '123' then '456' >>> mysub(one): 999 >>> mysub(one): 123 456 <== whoops! >>> >>> >>> >>> >>> -- >>> >>> >>> _______________________________________________ >>> Boston-pm mailing list >>> [email protected] >>> http://mail.pm.org/mailman/listinfo/boston-pm >>> >>> >> >> >> >> -- >> Bill Ricker >> [email protected] https://www.linkedin.com/in/n1vux >> >> > > > -- > > > > _______________________________________________ > Boston-pm mailing list > [email protected] > http://mail.pm.org/mailman/listinfo/boston-pm The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail. _______________________________________________ Boston-pm mailing list [email protected] http://mail.pm.org/mailman/listinfo/boston-pm
