On 10/04/2017 12:48 PM, Andy Bach wrote:
> I think maybe I don't understand how <<>> is used in a
and how <<>> differs from a ""
<<>> is quoteword, no commas needed. You get back a list. "" create a
string, you get back a single thing.
my $z=<<xyz{$x}def>>;
(xyz abc def)
is the same as
my $z=<<xyz $x def>>;
(xyz abc def)
So in this context "{$x}" means insert (interpolate) a
variable into the list? I was thinking it meant to
insert a variable into a string. Did saying <<>>
automatically tell Perl6 that this was a list
and not a sting?
> my $x = "ab";
ab
> my $z=<<xyz $x def>>;
(xyz ab def)
> my $y = "xxy $x def";
xxy ab def
> $z.WHAT
(List)
> $y.WHAT
(Str)
> my $q = ["xyz", $x, "def"];
[xyz ab def]
> $q.WHAT
(Array)
> my $r = ("xyz", $x, "def");
(xyz ab def)
> $r.WHAT
(List)
Hi Andy,
I am confused.
<code>
#!/usr/bin/env perl6
my $v = "aa bb cc";
my $w = <<dd ee ff>>;
my $x = qw[ gg hh ii ];
my $y = "jj" ~ <<kk>> ~ "ll";
my $z = <<xx{$v}yy{$w}zz>>;
say "\$v is a ",$v.WHAT, "\t $v";
say "\$w is a ",$w.WHAT, "\t $w";
say "\$x is a ",$x.WHAT, "\t $x";
say "\$y is a ",$y.WHAT, "\t $y";
say "\$z is a ",$z.WHAT, "\t $z";
</code>
$v is a (Str) aa bb cc
$w is a (List) dd ee ff
$x is a (List) gg hh ii
$y is a (Str) jjkkll
$z is a (List) xx aa bb cc yy dd ee ff zz
Why is not $y a list as well? Did <<>> switch back to being a ""
in this context?
And exactly what is a list? It looks like an array represented as a
space delimited string. Am I missing something?
And when is <<>> a "" and when is it not?
Thank you for the help!
-T
