NameError problem

ruby-talk
1

Hi. I'm sure it's been asked before, but I can't find the specific
answer. Basically I am doing the following..........

1.Created a ruby file Person.rb

class Person

def initialize(name,age)
@name = name
@age = age
end

def name
return @name
end

def age
return @age
end

end

2. I then run it

ruby Person.rb

3. Then when I try to instansiate a person object........

(in irb mode) p1 = Person.new("John",30)

I get the following error......

NameError: uninitialized constant Object::Person

I don't understand what I'm missing.

Thanks

···

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Posted via http://www.ruby-forum.com/.

2

Step 2 won't make your script available to irb. So until your script
does something else, step 2 won't do anything.

Step 3, in irb you need to:

require 'person'
p = Person.new('John', 30)

···

On Wed, Oct 5, 2011 at 7:53 PM, Paul Roche <prpaulroche@gmail.com> wrote:

Hi. I'm sure it's been asked before, but I can't find the specific
answer. Basically I am doing the following..........

1.Created a ruby file Person.rb

class Person

def initialize(name,age)
@name = name
@age = age
end

def name
return @name
end

def age
return @age
end

end

2. I then run it

ruby Person.rb

3. Then when I try to instansiate a person object........

(in irb mode) p1 = Person.new("John",30)

I get the following error......

NameError: uninitialized constant Object::Person

I don't understand what I'm missing.

Thanks

--
Posted via http://www.ruby-forum.com/\.

3

One more thing which you should know is that you do not need to specify
return statement if it's the last statement of the method in ruby. So
instead of:

def name
  return @name
end

You can write :

def name
  @name
end

Mayank

4

and if your getter and setter is only generic you could use

attr_reader :name #for reading
attr_writer :name #for writing
attr_accessor :name #for both

···

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5

Alternatively, you can invoke irb with the -r option:

$ irb -r yourlibrary

···

On Wed, Oct 5, 2011 at 7:33 PM, James Earl <james@truckhardware.ca> wrote:

Step 2 won't make your script available to irb. So until your script
does something else, step 2 won't do anything.

Step 3, in irb you need to:

require 'person'
p = Person.new('John', 30)

On Wed, Oct 5, 2011 at 7:53 PM, Paul Roche <prpaulroche@gmail.com> wrote:

Hi. I'm sure it's been asked before, but I can't find the specific
answer. Basically I am doing the following..........

1.Created a ruby file Person.rb

class Person

def initialize(name,age)
@name = name
@age = age
end

def name
return @name
end

def age
return @age
end

end

2. I then run it

ruby Person.rb

3. Then when I try to instansiate a person object........

(in irb mode) p1 = Person.new("John",30)

I get the following error......

NameError: uninitialized constant Object::Person

I don't understand what I'm missing.

Thanks

--
Posted via http://www.ruby-forum.com/\.

--
Carina