Web Programming TutorialsImplementation of Methods and Conditional statements in Ruby

Implementation of Methods and Conditional statements in Ruby

Today in this tutorial we will learn how to Write different methods and use of conditional statements in Ruby.

  • Follow the steps below and get the hands on experience :
  1. To start with ruby compiler go to
    Start->All Programs->RailsInstaller->Interactive Ruby
  2. 1
  3. After Opening the Interactive Ruby the following Command line interface will be displayed.
  4. 0

  5. To declare the method in ruby the syntax is as shown below :
  6. def methodname
    body of methods
    end
    

    1

    So in this if we have to create method the def keyword is used and to finish method end keyword is used.

  7. For Method With Arguments :
  8. Syntax is:

    def methodname(arg1,agr2,arg3…,argn)
    methodbody
    methodbody
    end
    

    The method with arguments can be displayed as in the following example:
    2

  9. System defined methods can also be declared as follows
  10. Example :
    The reverse function is as follows:

    'abcd'.reverse

    3

  11. If you want to know the list of all the methods in the ruby which may be working with string and numbers then use the following syntax :
  12.  “stringname”.methods 

    4

    number.methods

    5

  13. Now here is the exercise for Conditional Statements :
    1. if..else is one of the conditional statement
    2. Example :
      In this example we have taken variable fruit1 =”mango”

      fruit1 =”mango”

      we have taken one more variable fruit2 =”apple”

      fruit2 =”apple”

      Now if we compare it mango or apple it should display “This is a fruit” .

      if(fruit1=="mango")
      print 'This is fruit'
      end

      6

      As we can see in the above example we have taken variable
      fruit1 =”mango”
      so when we compare it with the following if statement it will display the following message :

      if(fruit1=="melon")
      print 'This is not mango'
      end

      7

    3. We can also put ‘&&’ and ‘||’ operator in it
    4. fruit1="Mango"
      fruit2="Grapes"
      if(fruit1=="Mango"&&fruit2=="Grapes")
      puts"I love both fruits"
      end

      8

  14. Thus we have learnt how to write methods and conditional statements in Ruby on Rails.

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