Impatient Perl - download pdf or read online

By Greg London

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The order of the keys will be based on the internal hashing algorithm used, and should not be something your program depends upon. Note in the example below that the order of assignment is different from the order printed out. my %pets = ( fish=>3, cats=>2, dogs=>1, ); foreach my $pet (keys(%pets)) { print "pet is '$pet'\n"; } > pet is 'cats' > pet is 'dogs' > pet is 'fish' If the hash is very large, then you may wish to use the each() function described below. 4 values( %hash ) Use values() to return a list of all the values in a hash.

After the last key/value pair is returned, the next call to each() will return an empty list, which is boolean false. This is how the while loop is able to loop through each key/value and then exit when done. Every hash has one "each iterator" attached to it. This iterator is used by perl to remember where it is in the hash for the next call to each(). Calling keys() on the hash will reset the iterator. The list returned by keys() can be discarded. keys(%hash); Do not add keys while iterating a hash with each().

When you refer to an entire array, use the "@" sigil. my @numbers = qw ( zero one two three ); When you index into the array, the "@" character changes to a "$" and the numeric index is placed in square brackets. my @numbers = qw ( zero one two three ); my $string = $numbers[2]; warn $string; > two ... 32 The length of an array is not pre-declared. Perl autovivifies whatever space it needs. 14, 9*11, 'yaba', 'daba' ); Negative indexes start from the end of the array and work backwards. my @colors = qw ( red green blue ); my $last=$colors[-1]; warn "last is '$last'"; > last is 'blue' ...

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Impatient Perl by Greg London


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