CODEWITHSUNDEEP
rubyclassvariablesobject
James Mitchell
James Mitchell

Reputation: 2467

Access variables in methods that are in a class, outside of that class

I have the following code that creates a viking game character and gives them random stats such as health, age and strength.

class Viking
    def initialize(name, health, age, strength)
        @name = name
        @health = health
        @age = age
        @strength = strength
    end
    def self.create_warrior(name)
        age = rand * 20 + 15
        health = [age * 5, 120].min
        strength = [age/2, 10].min
        Viking.new(name, health, age, strength)
    end
end

brad = Viking.create_warrior("Brad")

puts "New Warrior Created!"

The create_warrior function returns all those values, but how do I access them so I could see the stats.

For example this doesn't work but I would like to see the age or health of the new Viking brad (i.e brad.age even though that wouldn't work because it's not a method).

So how do I access those variables (without making them global).

Upvotes: 0

Views: 57

Answers (4)

PrimRock
PrimRock

Reputation: 1156

Use the attr_reader method, it creates a attribute method to point to the variable in the initialize method which is private. Its read-only

You can use attr_writer to write only

And attr_accessor to both read and write

class Viking

  attr_reader    :age, :name, :health, :strength

        def initialize(name, health, age, strength)
            @name = name
            @health = health
            @age = age
            @strength = strength
        end
        def self.create_warrior(name)
            age = rand * 20 + 15
            health = [age * 5, 120].min
            strength = [age/2, 10].min
            Viking.new(name, health, age, strength)
        end
    end

    brad = Viking.create_warrior("Brad")

    puts "New Warrior Created!"

Upvotes: 0

thaleshcv
thaleshcv

Reputation: 752

If you really don't want them global, try instance_variable_get method http://apidock.com/ruby/Object/instance_variable_get

puts brad.instance_variable_get(:@age)

Upvotes: 1

bigtunacan
bigtunacan

Reputation: 4986

Use attr_accessor :name, :health, :age, :strength if you would like the variables to be both readable and writable or attr_reader :name, :health, :age, :strength if you would like them to be read only.

After this you can access with brad.varname e.g. brad.name etc...

[Documentation]

Upvotes: 3

Francesco Belladonna
Francesco Belladonna

Reputation: 11689

Use attr_reader :age, so you can simply use brad.age, same goes for the other variables

Upvotes: 1

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