Re: shift vs @


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by grep (Monsignor)

on Oct 02, 2006 at 18:36 UTC ( [id://575925]=note: print w/replies, xml )

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in reply to shift vs @_

I will often use multiple shifts if I want to short circuit a sub when a non-true value is passed.

sub foo {
  my $bar = shift || return;
  my $baz = shift || return '<p style="font-color:red">BAD</p>';

}
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Again I'll note that this works only for non-true values, IOW if 0(zero) is acceptable then don't do this.

grep

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Re^2: shift vs @_ by ikegami (Patriarch) on Oct 02, 2006 at 21:14 UTC
if 0(zero) is acceptable then don't do this. More specifically, if one of the following is acceptable, then don't do this: `0` (numeical zero), `'0'` (the string consisting exactly of the character zero), `''` (the zero-length string), `undef` (the undefined value), or something that evaluates to one of the above in boolean context	[reply] [d/l] [select]
Re^2: shift vs @_ by exussum0 (Vicar) on Oct 02, 2006 at 20:59 UTC
'careful, perl's true may not coincide with real true. "0" and 0 are equivs.	[reply]

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