Is a key defined in a hash : key « Hash « Perl

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Perl » Hash » key

Is a key defined in a hash

   



$hash{fruit} = apple;

$hash{sandwich} = hamburger;

$hash{drink} = bubbly;



if (defined($hash{'vegetable'})) {

    print "Element is defined.";

} else {

    print "Element is not defined.";

}

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1.	Determine if the value for the key is defined
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3.	Is a key in a hash
4.	Is hash key defined and existed
5.	Using variable as the key to get the value stored in a hash

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