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Empty string: Difference between revisions
→{{header|Perl}}
Line 62:
System.out.println("s is not empty");
}</lang>
=={{header|Perl}}==
In Perl, an empty string is often used to represent a false value.
<lang Perl>$s = "";
if ($s) { ... } # false
# to tell if a string is false because it's empty, or it's plain not there (undefined)
$s = undef;
if (defined $s) { ... } # false; would be true on ""
# though, perl implicitly converts between strings and numbers, so this is also false
$s = "0";
if ($s) { ... } # false; also false on "000", "0.0", "\x0", "0 with text", etc
# but a string that converts to number 0 is not always false, though:
$s = "0 but true";
if ($s) { ... } # it's true! black magic!</lang>
=={{header|Perl 6}}==
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