enumeration with symbol name information

[Sasa]

Hello everybody...
I have a beginne's question:

I've created class for my numeric constants, it looks like:

class MyClass

NAME1 = 0
NAME2 = 1
NAME3 = 2
#etc...

def self.to_s(something)
case something
when 0
"NAME1"
when 1
"NAME2"
when 2
"NAME3"
#etc...
end
end

end


What is more elegant way to do this? Basically, I want to convert the
numerical value to string representation (ideally via identifier name).

Thanks in advance,
Sasa

 

[Mariusz Pękala]

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Hello everybody...
I have a beginne's question:
=20
I've created class for my numeric constants, it looks like:
=20
class MyClass
=20
NAME1 =3D 0
NAME2 =3D 1
NAME3 =3D 2
#etc...
=20
def self.to_s(something)
case something
when 0
"NAME1"
when 1
"NAME2"
when 2
"NAME3"
#etc...
end
end
=20
end
=20
=20
What is more elegant way to do this? Basically, I want to convert the=20
numerical value to string representation (ideally via identifier name).
=20
Thanks in advance,
Sasa=20

If your numeric values always start from 0, then you may use an array:

class MyClass
NAMES =3D [ 'NAME1','NAME2','NAME3' ]

def self.to_s(something) # personally I would rather avoid redefining cla=
ss.to_s
NAMES[something.to_i] || default_value
end
end

If this is unacceptable, you may use a hash:

NAMES =3D { 1 =3D> 'NAME1', 2 =3D> 'NAME2', 5 =3D> 'NAME3' }
NUMBERS =3D Hash[ *NAMES.map {|k,v| [v,k]}.flatten ] # may be useful :=
-)

def self.to_s(something)
NAMES[ something ] || defaul_value
end

def self.to_i(something) # may be useful
NUMBERS[ something ] || default_number
end

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