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  • Constructors in Ruby

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    Ruby also supports constructors like other Object Oriented Languages. Constructors are used to initialize the instance variables. In most of the Object Oriented Languages constructors has the same name as that of the class, and does not have any return type. Ruby has changed this convention and in this constructors are defined using the initialze keyword.

    It is written like any other ruby method starting with the def keyword. Whenver any instance of the class is created the initializer method is automatically called. It can also be overloaded like we used to overload the constructors in Object Oriented Languages like Java, C++ e.t.c

    A simple program to demonstrate the use of constructors in Ruby is given below :

    # player.rb  
    # define class Player
    class Player
        def initialize
          @team = "Aussie"
          @country = "Australia"
        end
        def display
          puts "Player belongs to #{@team}"
          puts "Player lives in #{@country}"
        end
    end
    
    p1 = Player.new()
    p1.display()
    puts "Instance Variables are = " + p1.instance_variables.to_s
    

    When we execute it, we get the following output :

    taran@taran-System-Product-Name:~/Documents/ruby_prgms$ ruby aa.rb
    Player belongs to Aussie
    Player lives in Australia
    Instance Variables are = [:@team, :@country]
    

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