JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA 2019 SCRIPTING LANGUAGES Previous Question Paper (April/May - 2019 - R17)

Perl is often described by the phenomenon of TMTOWTDI (There's More Than One Way To Do It), which emphasizes flexibility and expressive power, allowing developers to solve problems using various programming paradigms. Hashes in Perl are associative arrays that store data as unordered collections of key-value pairs. They are denoted by the prefix %. Keys are unique strings used to index the hash, and values can be any scalar data. Accessing a specific value is performed using the syntax $hash_name{$key}.

Objects in Perl are implemented using references and packages. An object is simply a reference that knows which class it belongs to, achieved through the bless function. A class is a package that provides methods to operate on these objects. When a method is called, the object reference is passed as the first argument, typically referred to as $self. Perl supports inheritance through the @ISA array, allowing classes to inherit methods from parent classes.