I am trying to figure out if it is possible to pass a value between methods in a Ruby class.
I haven't found much on my own and figured I would ask the experts. Could it be done passed as a arg/parameter to another method as well?
class PassingValues
def initialize
@foo = 1
end
def one
@foo += 1
end
def two
@foo += 1
end
def three
p @foo
end
end
bar = PassingValues.new
If I wanted this to print out foo value of 3:
bar.three
If you want bar.three to print a 3 you will need to call before the one and two methods to ensure the variable is updated to the three so:
class PassingValues
def initialize
@foo = 1
end
def one
@foo += 1
end
def two
one
@foo += 1
end
def three
two
p @foo
end
end
Anyway this doesn't make sense as long as the methods will be eventually modifying the variable, so each time you call one of them the number will increase the amount expected.
Those are instance methods, not class methods. And @foo is already shared among them.
bar = PassingValues.new
bar.one
bar.two
bar.three
In this case @foo is an instance variable and it can be referenced (it is not passed here) in any method of the class.
When you call you create bar as an instance of the class using: PassingValues.new
it is initialized, and sets @foo to 1.
When you then call the method three using bar.three, you simply print out @foo, which is still equal to 1.
You can change your three method to increment @foo by 2, so it is now equal to 3, then print:
def three
@foo += 2
p @foo
end
