The utility of attr_writer

[nio kasgami]

I check the attr_ topic but

i am a little lost when is speak about the attr_writer...

I know attr_accessor permit to change data in game

and 

attr_reader serve for force a reading of a specific data

but I don't know what is the use of attr_writer

I hope people will can help me :3!

 

[Another Fen]

For short:

attr_reader :value creates a method to read an attributes value, attr_writer :value creates a method to change an attributes value and attr_accessor :value creates both of these methods.

I usually use attr_writer instead of attr_accessor when I want to redefine the corresponding read-method anyway, for example to lazily initialize an attribute:

attr_writer :value def value  return defined?(@value) ? @value : 0end

 

[nio kasgami]

For short:

attr_reader :value creates a method to read an attributes value, attr_writer :value creates a method to change an attributes value and attr_accessor :value creates both of these methods.

Ho so easy I never knew attr_accessor do both...

 

[whitesphere]

You would use attr_writer if you had an internal class member you wanted outside users only to modify, but not read. 

I rarely use it, myself.  Most often, I use attr_accessor or attr_reader.

Basically, attr_reader creates a function like this:

def var_name

  var_name

end

Attr_writer creates a function like this (I may have this syntax wrong):

def var_name=(new_value)

@var_name=new_value

end

Attr_accessor creates both functions.

 

[nio kasgami]

You would use attr_writer if you had an internal class member you wanted outside users only to modify, but not read. 

I rarely use it, myself.  Most often, I use attr_accessor or attr_reader.

Basically, attr_reader creates a function like this:

def var_name

  var_name

end

Attr_writer creates a function like this (I may have this syntax wrong):

def var_name=(new_value)

@var_name=new_value

end

Attr_accessor creates both functions.

Ho thanks this is more clear so the attr_writer don't have really ''use'' in it I never saw someone using it ...

 

[BoluBolu]

Ho thanks this is more clear so the attr_writer don't have really ''use'' in it I never saw someone using it ...

Yeah in custom script RGSS3, why not do attr_accessor instead of attr_writer, it's your custom script so you should have full authority about all things inside your script. =)