On Sat, May 16, 2020 at 03:19:05PM -0700, ToddAndMargo via perl6-users wrote: > On 2020-05-16 06:38, Peter Pentchev wrote: > > > $ raku *-e* "your one-liner script here" > > And also you might want to put some quotes around the paths to let Raku > > know that those are strings and not some identifiers or something. > > > > G'luck, > > Peter > > > > Hi Peter, > > This is what goofed me up: > > $ alias p5 > alias p5='perl -E' > > $ alias p6 > alias p6='perl6 -e' > > I have no such feature on the Windows side and had > forgot about it. > > Also, if you tack a .Bool on the end of IO.d, you > get back True or False, instead of the useless True > or Crash. I updates my perl6.IO.txt keeper file. > > And IO.e also works for directories
What you're doing with "tacking .Bool at the end" is usually not necessary to do explicitly, because most people do not "say" the result of .d or .e, but use it in an if, for, while or some such conditional statement, in which case Raku automatically converts the expression to a boolean, i.e. tacks a .Bool at the end. The reason .d and .e return a failure otherwise is that in some cases they may be used not in a conditional statement, but as a kind of assertion - "I really, really think that at this point this variable should contain a valid path to an existing directory, but if something went wrong in my program and the variable does not contain that, I do not want the program to go on, it would be useless, I *want* it to raise an exception when the value is used". At least that's what I think; I *know* that the people who rewrote .IO in v6.d are on this list, so please correct me if I'm wrong :) But the most common use of .d, .e, .f and similar, the most common by a very large margin, is in conditionals, where Raku does the conversion to a boolean value automatically. G'luck, Peter -- Peter Pentchev r...@ringlet.net r...@debian.org p...@storpool.com PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint 2EE7 A7A5 17FC 124C F115 C354 651E EFB0 2527 DF13
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