What would be the best variable usage in Ruby?
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I am encountering few doubts regarding the best approach to use classes and scoped variables in Ruby.
While saving information in a file, using a specific class in order to do it, I would personally store the concerned data in a class variable during the instantiation, instead of instantiating and calling another function directly with the params.
Since I am not really clear, here are the two points I am talking about :
# from another class, could be called with the following syntax :
# className.new('some params').create
def initialize(params)
@params = params
end
def create
File.open 'data.csv', 'a+' do |file|
file.write @params
end
end
# usage : className.new('some params').create
The other possible method would be to only instantiate the class, and passing all the params by calling the create function.
def initialize
end
def create(params)
File.open 'data.csv', 'a+' do |file|
file.write params
end
end
# usage :
class_instance = className.new
class_instance.create 'some params'
From your point of view, which method should be definitively used ? Is there a lack of performance in a case ? What are the risks about using one or another method ?
ruby class variables
asked Nov 15 '18 at 9:33
AtilleAtille
312
|
show 3 more comments
I am encountering few doubts regarding the best approach to use classes and scoped variables in Ruby.
While saving information in a file, using a specific class in order to do it, I would personally store the concerned data in a class variable during the instantiation, instead of instantiating and calling another function directly with the params.
Since I am not really clear, here are the two points I am talking about :
# from another class, could be called with the following syntax :
# className.new('some params').create
def initialize(params)
@params = params
end
def create
File.open 'data.csv', 'a+' do |file|
file.write @params
end
end
# usage : className.new('some params').create
The other possible method would be to only instantiate the class, and passing all the params by calling the create function.
def initialize
end
def create(params)
File.open 'data.csv', 'a+' do |file|
file.write params
end
end
# usage :
class_instance = className.new
class_instance.create 'some params'
From your point of view, which method should be definitively used ? Is there a lack of performance in a case ? What are the risks about using one or another method ?
ruby class variables
asked Nov 15 '18 at 9:33
AtilleAtille
312
1
The latter is better, plus thecreatemethod should be a class method (static.)
– Aleksei Matiushkin
Nov 15 '18 at 9:43
Could you please argument why the latter is better ?
– Atille
Nov 15 '18 at 9:46
1
It does not produce a garbage instance variable :) Also, it’s always better to keep parameters as near to their usage as possible.
– Aleksei Matiushkin
Nov 15 '18 at 9:47
Is this true in a case of multi calls ? I mean using thecreate(params), then amail(params)function, from the same class ? I would have to update two or more information from my script to make it correct, instead of simply updating my initialize() function.
– Atille
Nov 15 '18 at 9:55
If multiple calls are all have the same params, there is a design flaw. If params differ from call to call then the former approach just won’t work. And let me repeat it in bold, make the method static to avoid class instantiation at all.
– Aleksei Matiushkin
Nov 15 '18 at 9:57
|
show 3 more comments
I am encountering few doubts regarding the best approach to use classes and scoped variables in Ruby.
While saving information in a file, using a specific class in order to do it, I would personally store the concerned data in a class variable during the instantiation, instead of instantiating and calling another function directly with the params.
Since I am not really clear, here are the two points I am talking about :
# from another class, could be called with the following syntax :
# className.new('some params').create
def initialize(params)
@params = params
end
def create
File.open 'data.csv', 'a+' do |file|
file.write @params
end
end
# usage : className.new('some params').create
The other possible method would be to only instantiate the class, and passing all the params by calling the create function.
def initialize
end
def create(params)
File.open 'data.csv', 'a+' do |file|
file.write params
end
end
# usage :
class_instance = className.new
class_instance.create 'some params'
From your point of view, which method should be definitively used ? Is there a lack of performance in a case ? What are the risks about using one or another method ?
ruby class variables
asked Nov 15 '18 at 9:33
AtilleAtille
312
I am encountering few doubts regarding the best approach to use classes and scoped variables in Ruby.
While saving information in a file, using a specific class in order to do it, I would personally store the concerned data in a class variable during the instantiation, instead of instantiating and calling another function directly with the params.
Since I am not really clear, here are the two points I am talking about :
# from another class, could be called with the following syntax :
# className.new('some params').create
def initialize(params)
@params = params
end
def create
File.open 'data.csv', 'a+' do |file|
file.write @params
end
end
# usage : className.new('some params').create
The other possible method would be to only instantiate the class, and passing all the params by calling the create function.
def initialize
end
def create(params)
File.open 'data.csv', 'a+' do |file|
file.write params
end
end
# usage :
class_instance = className.new
class_instance.create 'some params'
From your point of view, which method should be definitively used ? Is there a lack of performance in a case ? What are the risks about using one or another method ?
ruby class variables
ruby class variables
asked Nov 15 '18 at 9:33
AtilleAtille
312
asked Nov 15 '18 at 9:33
AtilleAtille
312
asked Nov 15 '18 at 9:33
AtilleAtille
312
asked Nov 15 '18 at 9:33
AtilleAtille
312
asked Nov 15 '18 at 9:33
AtilleAtille
312
312
1
The latter is better, plus thecreatemethod should be a class method (static.)
– Aleksei Matiushkin
Nov 15 '18 at 9:43
Could you please argument why the latter is better ?
– Atille
Nov 15 '18 at 9:46
1
It does not produce a garbage instance variable :) Also, it’s always better to keep parameters as near to their usage as possible.
– Aleksei Matiushkin
Nov 15 '18 at 9:47
Is this true in a case of multi calls ? I mean using thecreate(params), then amail(params)function, from the same class ? I would have to update two or more information from my script to make it correct, instead of simply updating my initialize() function.
– Atille
Nov 15 '18 at 9:55
If multiple calls are all have the same params, there is a design flaw. If params differ from call to call then the former approach just won’t work. And let me repeat it in bold, make the method static to avoid class instantiation at all.
– Aleksei Matiushkin
Nov 15 '18 at 9:57
|
show 3 more comments
1
The latter is better, plus thecreatemethod should be a class method (static.)
– Aleksei Matiushkin
Nov 15 '18 at 9:43
Could you please argument why the latter is better ?
– Atille
Nov 15 '18 at 9:46
1
It does not produce a garbage instance variable :) Also, it’s always better to keep parameters as near to their usage as possible.
– Aleksei Matiushkin
Nov 15 '18 at 9:47
Is this true in a case of multi calls ? I mean using thecreate(params), then amail(params)function, from the same class ? I would have to update two or more information from my script to make it correct, instead of simply updating my initialize() function.
– Atille
Nov 15 '18 at 9:55
If multiple calls are all have the same params, there is a design flaw. If params differ from call to call then the former approach just won’t work. And let me repeat it in bold, make the method static to avoid class instantiation at all.
– Aleksei Matiushkin
Nov 15 '18 at 9:57
1
1
The latter is better, plus the
create method should be a class method (static.)– Aleksei Matiushkin
Nov 15 '18 at 9:43
The latter is better, plus the
create method should be a class method (static.)– Aleksei Matiushkin
Nov 15 '18 at 9:43
Could you please argument why the latter is better ?
– Atille
Nov 15 '18 at 9:46
Could you please argument why the latter is better ?
– Atille
Nov 15 '18 at 9:46
1
1
It does not produce a garbage instance variable :) Also, it’s always better to keep parameters as near to their usage as possible.
– Aleksei Matiushkin
Nov 15 '18 at 9:47
It does not produce a garbage instance variable :) Also, it’s always better to keep parameters as near to their usage as possible.
– Aleksei Matiushkin
Nov 15 '18 at 9:47
Is this true in a case of multi calls ? I mean using the
create(params), then a mail(params) function, from the same class ? I would have to update two or more information from my script to make it correct, instead of simply updating my initialize() function.– Atille
Nov 15 '18 at 9:55
Is this true in a case of multi calls ? I mean using the
create(params), then a mail(params) function, from the same class ? I would have to update two or more information from my script to make it correct, instead of simply updating my initialize() function.– Atille
Nov 15 '18 at 9:55
If multiple calls are all have the same params, there is a design flaw. If params differ from call to call then the former approach just won’t work. And let me repeat it in bold, make the method static to avoid class instantiation at all.
– Aleksei Matiushkin
Nov 15 '18 at 9:57
If multiple calls are all have the same params, there is a design flaw. If params differ from call to call then the former approach just won’t work. And let me repeat it in bold, make the method static to avoid class instantiation at all.
– Aleksei Matiushkin
Nov 15 '18 at 9:57
|
show 3 more comments
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1
The latter is better, plus the
createmethod should be a class method (static.)– Aleksei Matiushkin
Nov 15 '18 at 9:43
Could you please argument why the latter is better ?
– Atille
Nov 15 '18 at 9:46
1
It does not produce a garbage instance variable :) Also, it’s always better to keep parameters as near to their usage as possible.
– Aleksei Matiushkin
Nov 15 '18 at 9:47
Is this true in a case of multi calls ? I mean using the
create(params), then amail(params)function, from the same class ? I would have to update two or more information from my script to make it correct, instead of simply updating my initialize() function.– Atille
Nov 15 '18 at 9:55
If multiple calls are all have the same params, there is a design flaw. If params differ from call to call then the former approach just won’t work. And let me repeat it in bold, make the method static to avoid class instantiation at all.
– Aleksei Matiushkin
Nov 15 '18 at 9:57