help solving problem in ruby

[Govinda Khanal]

i am a beginner and having problem in linux with this code:

class Song
def to_s
"Song: #@name--#@artist (#@duration)"
end
end
song = Song.new("Bicylops", "Fleck", "2.60")
song.to_s




=> the output looks like this:


a.rb:6:in `initialize': wrong number of arguments (3 for 0)
(ArgumentError)
from a.rb:6:in `new'
from a.rb:6

 

[pharrington]

i am a beginner and  having problem in linux with this code:

class Song
  def to_s
    "Song: #@name--#@artist (#@duration)"
  end
end
song = Song.new("Bicylops", "Fleck", "2.60")
song.to_s

=> the output looks like this:

a.rb:6:in `initialize': wrong number of arguments (3 for 0)
(ArgumentError)
  from a.rb:6:in `new'
  from a.rb:6

In Ruby one can reopen a class at anytime and "monkey patch" it to add
new methods etc. Looks like you skipped the part in Programming Ruby
where the Song class was initially defined.

 

[Michael W. Ryder]

i am a beginner and having problem in linux with this code:

class Song
def to_s
"Song: #@name--#@artist (#@duration)"
end
end
song = Song.new("Bicylops", "Fleck", "2.60")
song.to_s




=> the output looks like this:


a.rb:6:in `initialize': wrong number of arguments (3 for 0)
(ArgumentError)
from a.rb:6:in `new'
from a.rb:6

If you looked earlier in the chapter you would have seen an initialize
method that needs to be part of the Song class.

 

[Govinda Khanal]

thanx for your help i solve the problem ...

what actually is to_s and when we use this one?

 

[Govinda Khanal]

yes, i skipped the first part. thanx for your help...

 

[Michael W. Ryder]

thanx for your help i solve the problem ...

what actually is to_s and when we use this one?

to_s converts an object to a string. In this case it converts the song
object to a format more readable than just using puts. It is also used
to convert numbers to strings, etc.

 

[Steve Wilhelm]

yes, i skipped the first part. thanx for your help...

For the sake of other beginners, added initialize and a puts to last
line. Note, last line could be simplified to 'puts song'.


class Song
def initialize(name, artist, duration)
@name, @artist, @duration = name, artist, duration
end
def to_s
"Song: #@name--#@artist (#@duration)"
end
end

song = Song.new("Bicylops", "Fleck", "2.60")

puts song.to_s # => Song: Bicylops--Fleck (2.60)