comment on

A clearer way of doing the above without a block is simply to test $x for being true (since all refs are true) first...

Well, not quite. The code you proposed would still result in a warning if $x is 1, for example:

% perl -MScalar::Util=reftype -we '$x=1; my $y=($x and reftype $x eq q
+(HASH))'
Use of uninitialized value in string eq at -e line 1.
[download]

What needs to be tested is that the value returned by reftype $x is defined. So your solution should be cast as

...( reftype $x and reftype $x eq 'HASH' )...
[download]

or, two avoid the duplicate calls to reftype:

{
  my $temporary_variable = reftype $x;
  ...( $temporary_variable and $temporary_variable eq 'HASH' )...
}
[download]

Update: Fixed missing "$x and " in the one-liner.

the lowliest monk

In reply to Re^2: Annoying warnings... by tlm
in thread Annoying warnings... by tlm

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		`&`
	<		`<`
	>		`>`
	[		`[`
	]		`]`

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.


laziness, impatience, and hubris
	PerlMonks