diff options
Diffstat (limited to 'pod/perldata.pod')
| -rw-r--r-- | pod/perldata.pod | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/pod/perldata.pod b/pod/perldata.pod index 6b4f7a4053..4042ecf74e 100644 --- a/pod/perldata.pod +++ b/pod/perldata.pod @@ -40,7 +40,7 @@ Every variable type has its own namespace. You can, without fear of conflict, use the same name for a scalar variable, an array, or a hash (or, for that matter, a filehandle, a subroutine name, or a label). This means that $foo and @foo are two different variables. It also -means that $foo[1] is a part of @foo, not a part of $foo. This may +means that C<$foo[1]> is a part of @foo, not a part of $foo. This may seem a bit weird, but that's okay, because it is weird. Since variable and array references always start with '$', '@', or '%', @@ -203,9 +203,22 @@ price is $100." print "The price is $Price.\n"; # interpreted As in some shells, you can put curly brackets around the identifier to -delimit it from following alphanumerics. Also note that a +delimit it from following alphanumerics. In fact, an identifier +within such curlies is forced to be a string, as is any single +identifier within a hash subscript. Our earlier example, + + $days{'Feb'} + +can be written as + + $days{Feb} + +and the quotes will be assumed automatically. But anything more complicated +in the subscript will be interpreted as an expression. + +Note that a single-quoted string must be separated from a preceding word by a -space, since single quote is a valid (though discouraged) character in +space, since single quote is a valid (though deprecated) character in an identifier (see L<perlmod/Packages>). Two special literals are __LINE__ and __FILE__, which represent the @@ -218,7 +231,7 @@ filehandle may read data only from the main script, but not from any required file or evaluated string.) The two control characters ^D and ^Z are synonyms for __END__. -A word that doesn't have any other interpretation in the grammar will +A word that has no other interpretation in the grammar will be treated as if it were a quoted string. These are known as "barewords". As with filehandles and labels, a bareword that consists entirely of lowercase letters risks conflict with future reserved @@ -311,7 +324,7 @@ List values are denoted by separating individual values by commas (LIST) -In a context not requiring an list value, the value of the list +In a context not requiring a list value, the value of the list literal is the value of the final element, as with the C comma operator. For example, |