Perl | keys() Function
Last Updated :
25 Jun, 2019
keys() function in Perl returns all the keys of the HASH as a list. Order of elements in the List need not to be same always, but, it matches to the order returned by values and each function.
Syntax: keys(HASH)
Parameter:
HASH: Hash whose keys are to be printed
Return: For scalar context, it returns the number of keys in the hash whereas for List context it returns a list of keys.
Example 1:
%hash = ( 'Ten' => 10,
'Eleven' => 11,
'Twelve' => 12,
'Thirteen' => 13);
@values = values ( %hash );
print ( "Values are " , join ( "-" , @values ), "\n" );
@keys = keys ( %hash );
print ( "Keys are " , join ( "-" , @keys ), "\n" );
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Output:
Values are 11-12-13-10
Keys are Eleven-Twelve-Thirteen-Ten
Example 2:
%hash = ( 'Geek' => 1,
'For' => 2,
'Geeks' => 3);
@values = values ( %hash );
print ( "Values are " , join ( "-" , @values ), "\n" );
@keys = keys ( %hash );
print ( "Keys are " , join ( "-" , @keys ), "\n" );
|
Output:
Values are 3-2-1
Keys are Geeks-For-Geek
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