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Re: shift vs @_

by grep (Monsignor)
on Oct 02, 2006 at 18:36 UTC ( #575925=note: print w/replies, xml ) Need Help??

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>'; }

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

Mynd you, mønk bites Kan be pretti nasti...

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Re^2: shift vs @_
by ikegami (Pope) 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
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.

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