Basics of Ruby

Today I learnt the basics of Ruby...

A program written in Ruby will have a file extension with .rb(not mandatory)

Ruby program execution goes from Top-Down approach

Syntax rules in Ruby...

1.Free format
2.Case Sensitive ( AB and ab or not the same..)
3. Single line comment can be given using #, Multiple line comment using =begin and = end

Example 1(using 1- line comment) :

puts " Leader" # This is a Ruby code which outputs "Leader"

Example 2 (Using multiple line comment)

puts "Leader"

=begin
'puts' means put a string
It outputs the string in the quotes
=end

4. No delimeter for a single line.....but should use semicolon(;) for multiple statements in one line

Example 1 : puts "Leader" output : Leader

Example2 : puts "Gandhi"; puts "is a great Leader" output : Gandhi is a great Leader

Linefeed is treated like a semicolon
If a line ends with a backslash (\), the linefeed following it is ignored;
this allows us to have a single logical line that spans several lines

5. Keywords

There are around 38 keywords in Ruby.These are reserved and cannot be used for other purposes

Keywords in Ruby

1. alias


2. and


3. BEGIN


4. begin


5. break


6. case


7. class


8. def


9. defined


10. do


11. else


12. elsif


13. END


14. end


15. ensure


16. false


17. for


18. if


19. in


20. module


21. next


22. nil


23. not


24. or


25. redo


26. rescue


27. retry


28. return


29. self


30. super


31. then


32. true


33. undef


34. unless


35. until


36. when


37. while


38. yield

Note : False and Nil are reserved words in Ruby....so they can't be used as(Zero)