exists() Function, Hash Key, Syntax, Example, Perl Programming Tutorial

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Perl Hash Key exists() Function

Tutorials

Perl

Topic

What is exists() Function in Perl in programming?

Explanation

The exists() function is used to test whether a hash key is present.

Syntax:

    exists hash;

Example:

    #! C:\programfiles\perl\bin\perl
    print "content-type: text/html\n\n";
    %emp = ('empno' => '12422' , 'empname' => 'Kate Anderson', 
      'empph' => '9167552148', 'empcode' => 'ADS212');
    if (exists $emp{'empcode'})
     {
     print "Employee Code Exists!!\n";
     }
    else
     {
      print "Employee Code Missing??\n";
     }

Result:

    Employee Code Exists!!

In the above example using the exists() function the key "empcode" is checked in the hash "emp", as it is present it displays "Employee Code Exists!!".

A Note

Simple introduction, basic CGI perl programming codes with examples. Do send your feedback or suggestions on this tutorial. This is a copyright content.