Re^4: Scope Issue

I tried || and // and they both worked. Thanks to everyone for your contribution!

Comment on Re^4: Scope Issue

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Re^5: Scope Issue by GrandFather (Saint) on Mar 15, 2011 at 21:03 UTC
Note that \|\| and // have different effects when the variable being tested is false! // only tests for undefined. \|\| tests for any false value. \|\|= will replace 0 or '' with the right hand side value where //= will only replace undef with the right hand side value. //= behaves like: `$var = $defaultValue if ! defined $var;` \|\|= behaves like: `$var = $defaultValue if ! $var;` True laziness is hard work	[reply] [d/l] [select]

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Re^5: Scope Issue
by GrandFather (Saint) on Mar 15, 2011 at 21:03 UTC

Note that || and // have different effects when the variable being tested is false! // only tests for undefined. || tests for any false value. ||= will replace 0 or '' with the right hand side value where //= will only replace undef with the right hand side value.

//= behaves like:

$var = $defaultValue if ! defined $var;

||= behaves like:

$var = $defaultValue if ! $var;

True laziness is hard work

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