Open In App
Related Articles

Perl | exists() Function

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Report issue
Report
The exists() function in Perl is used to check whether an element in an given array or hash exists or not. This function returns 1 if the desired element is present in the given array or hash else returns 0.
Syntax: exists(Expression) Parameters: Expression : This expression is either array or hash on which exists function is to be called. Returns: 1 if the desired element is present in the given array or hash else returns 0.
Example 1: This example uses exists() function over an array.
#!/usr/bin/perl 
  
# Initialising an array
@Array = (10, 20, 30, 40, 50);
  
# Calling the for() loop over
# each element of the Array
# using index of the elements
for ($i = 0; $i < 10; $i++)
{
      
    # Calling the exists() function
    # using index of the array elements
    # as the parameter
    if(exists($Array[$i]))
    {
        print "Exists\n";
    }
    else
    {
        print "Not Exists\n"
    }
}

                    
Output:
Exists
Exists
Exists
Exists
Exists
Not Exists
Not Exists
Not Exists
Not Exists
Not Exists
In the above code, it can be seen that parameter of the exists() function is the index of each element of the given array and hence till index 4 (index starts from 0) it gives output as “Exists” and later gives “Not Exists” because index gets out of the array. Example 2: This example uses exists() function over a hash.
#!/usr/bin/perl 
  
# Initialising a Hash
%Hash = (Mumbai => 1, Kolkata => 2, Delhi => 3);
  
# Calling the exists() function
if(exists($Hash{Mumbai}))
{
    print "Exists\n";
}
else
{
    print "Not Exists\n"
}
  
# Calling the exists() function
# with different parameter
if(exists($Hash{patna}))
{
    print "Exists\n";
}
else
{
    print "Not Exists\n"
}

                    
Output :
Exists
Not Exists
In the above code, exists() function takes the key of the given hash as the parameter and check whether it is present or not.

Last Updated : 07 May, 2019
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads