Struct with defaults?

ruby-talk
1

is there an easy, elegant way to set up a Struct so it has defaults on
initialization?

(besides def initialize?)

···

--
Giles Bowkett
http://www.gilesgoatboy.org

2

Not an exact answer to your question, but would using OpenStruct fit the bill?

#!/usr/bin/env ruby

require 'ostruct'

user = OpenStruct.new({:name => 'Bob', :uid => 1234})
p user.name
p user.uid
user.name = 'Fred'
p user.name

···

On Nov 16, 2006, at 12:30 PM, Giles Bowkett wrote:

is there an easy, elegant way to set up a Struct so it has defaults on
initialization?

(besides def initialize?)

-- Giles Bowkett
http://www.gilesgoatboy.org

3

Hi,

At Fri, 17 Nov 2006 03:30:40 +0900,
Giles Bowkett wrote in [ruby-talk:225339]:

is there an easy, elegant way to set up a Struct so it has defaults on
initialization?

(besides def initialize?)

  class User < Struct.new(:name, :uid)
    def initialize(name = 'Bob', uid = 1234)
      super
    end
  end

···

--
Nobu Nakada

4

This just fills an instance with values. You would have to encapsulate that in a method like

def create() OpenStruct.new(:name => 'Bob', :uid => 1234) end

to match the OP's requirements. That can also be done with a Struct

S = Struct.new(:name, :uid)
def S.create() new('Bob', 1234) end

irb(main):003:0> S.create
=> #<struct S name="Bob", uid=1234>

Kind regards

  robert

···

On 17.11.2006 00:25, lists wrote:

On Nov 16, 2006, at 12:30 PM, Giles Bowkett wrote:

is there an easy, elegant way to set up a Struct so it has defaults on
initialization?

(besides def initialize?)

-- Giles Bowkett
http://www.gilesgoatboy.org

Not an exact answer to your question, but would using OpenStruct fit the bill?

#!/usr/bin/env ruby

require 'ostruct'

user = OpenStruct.new({:name => 'Bob', :uid => 1234})
p user.name
p user.uid
user.name = 'Fred'
p user.name

5

that is easy and elegant! exactly as requested -- thank you!

···

On 11/17/06, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:

Hi,

At Fri, 17 Nov 2006 03:30:40 +0900,
Giles Bowkett wrote in [ruby-talk:225339]:
> is there an easy, elegant way to set up a Struct so it has defaults on
> initialization?
>
> (besides def initialize?)

  class User < Struct.new(:name, :uid)
    def initialize(name = 'Bob', uid = 1234)
      super
    end
  end

--
Nobu Nakada

--
Giles Bowkett
http://www.gilesgoatboy.org