Hire Top Perl developers with Ultragenius

Perl stands for Practical Extension and Reporting Language. Perl was originally developed for text manipulation and string analysis. Perl is widely used for processing text, extracting the information from a variety of text-formats and generate reports, and also for database connectivity and querying. Perl supports both Procedural and Object-Oriented programming. Perl also provides support for socket capabilities.

• Perl provides an excellent interface called DBI which communicates with the database to fetch data using SQL queries.
• Perl-based web servers are used with limited resources systems
• Perl provides support to interact easily with Google Cloud's speech APIs and is widely used in speech recognition.
• Perl is greatly used for text manipulation and string analysis. Perl is the goto language for HTML parsing, JSON  manipulation, regex, etc.
• Perl is used for screen reading, enabling multi-tasking possibilites.
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$_ is a special variable used in Perl, which has the default-input and pattern-searching string. While $@ represents az type of erro. $@ is set if the string to be evaluated didn't compile or if the Perl code which is to be executed die(). In such cases, the error is the argument to die or a compile-time error.

Perl's shift() function returns the array's first element value, removes it, and shifts all the array elements to the left by one position. shift() removes the element just like the pop() function in array but instead of removing the first element from the end, it removes the first element from the start.

Perl's unshift() function shifts multiple values of an array by right position and places a given array list elements at the beginning of that array. The unshift() function returns the total number of new elements in the array.

For example, 

@array = (10,20,30,40,50);

print "Original array : @array\n";

print "Total no. of elements after unshift() function is applied : ", unshift(@array, 70, 80, "UltraGenius");

print "\nUpdated array : @array\n";

The output of the above code is - 

Original array : 10 20 30 40 50

Total no. of elements after unshift() function is applied : 8

Updated array : 70 80 UltraGenius 10 20 30 40 50

The chop() function removes the last character from the input string. For example, $string = "Welcome to UltraGenius!!!";

@chopped = chop($string);

print " $string\n";

print "@chopped";

The output of the program will be - 

Welcome to UltraGenius!!

!

While the chomp() function removes the last trailing newline from the input string. 

Quantifiers are used in regular expressions to determine how many times a given character is repeated before pattern  matching is completed. There are six different types of quantifiers which are used in regular expressions - 

• + - It tells a component is present one or more times in a regular expression.
• * - It tells a component is present zero or more times in a regular expression.
• ? - It tells a component must be present zero or one time in a regular expression.
• {n} - It tells that a component must be present n times in a regular expression.
• {n, } - It tells that a component must be present at least n times in a regular expression.
• {n,m} - It tells that a component must be present at least n times but not more than m times in  a regular expression. 

The Special Character Classes in Perl are - 

• Digit Character\d - The \d indicates the digit character class matches any digit present in the regex to [0-9].
• PO Six Character Classes - PO Six Character Classes defines an application programming interface (API) with command line interfaces and utility interfaces. The PO Six has the format of [:class:], where [: , :] are the delimiters and class is any group of characters like alpha, ascii, blank, alnum, lower, digit, punct, cntrl, graph, etc.
• Word Character \w - The Word Character Classes is represented by \w and is used for matching any alpha-numeric character and underscore [A - Z, a - z, 0 - 9, _].
• Whitespace Character Class \s - The \s belongs to Whitespace character class and used to match a single character - whitespace. It will also match the \t (horizontal tab), \n (the newline), \f (form feed), \r (carriage return), and the space.
•  Negated Character Classes (\D, \W, \S ) - The negated character class \D [^\d] indicates non-digit character, \W [^\w] matches any non-word character, and \S [^\s] matches any non-whitespace character.

• Encapsulation – Encapsulation is binding the data members and functions that expose only the functions in the class and hide the private members. 

It is an important concept used widely in software development and helps reduce software complexity, protect the internal state of an object as accessing the variables/members is possible through getter and setter methods. Also, the implementation inside methods can be changed without breaking the code which is using that class.

• Inheritance – Inheritance is a real-time demand of every code which allows one class to extend the functionality of another class. The core feature of Inheritance is Re-usability. The class inheriting the class is called the child class or subclass and the class that is being inherited is called parent class or superclass. Instead of thousands of lines of code every time, developers can utilize the same code in inheriting classes as well. 

• Abstraction – Abstraction is the process of defining the core functionalities of any class, hiding its implementation details. It tells what a class does instead of how it does. Here, you can ask the difference between Encapsulation and Abstraction, the former shows the inner implementation, and the latter shows the outer implementation. For example, take the example of a mobile phone, Encapsulation is how the display screen and keypad button are connected using circuits while Abstraction is any user can dial a number using the display screen and keypad button. 

• Polymorphism – Polymorphism is the ability of any data to take more than one form. It is of two types – Compile-time Polymorphism and Run-time Polymorphism.
  In compile-time polymorphism, function overloading is implemented in which one function with the same name can have a different number of arguments and different return types.
  In run-time polymorphism, function overriding is implemented in which the child class / sub-class decides the implementation of the parent class / base-class function.

If you are trying to hire a Perl Developer. Here is the Perl Developer Job Description that you can use in your hiring.