From: "Brian Schröder" <ruby.brian@...>
Date: 2005-10-28T01:56:42+09:00
Subject: Re: Initializing a Struct from an array

On 27/10/05, John Lam <drjflam@gmail.com> wrote:
> I'm writing some code to dump database tables into in-memory hashtables.
> Here's an example:
>
> Foo = Struct.new('Foo', :id, :a, :b, :c)
> conn.select_all('select * from foo').each do |h|
> current = Foo.new(h[0], h[1], h[2], h[3])
> @foo_map[current.id <http://current.id>] = current
> end
>
> It's the Foo.new ... part that bugs me. Is there a nice clean way of
> initializing a Struct from an array?
>
> Thanks
> -John
> http://www.iunknown.com
>
>

Foo.new(*h)

generally

irb(main):002:0* def t(a, b = nil, c = nil)
irb(main):003:1>   p [a,b,c]
irb(main):004:1> end
=> nil
irb(main):005:0>
irb(main):006:0* t(1)
[1, nil, nil]
=> nil
irb(main):007:0> t(1,2,3)
[1, 2, 3]
=> nil
irb(main):008:0> t([1,2,3])
[[1, 2, 3], nil, nil]
=> nil
irb(main):009:0> t(*[1,2,3])
[1, 2, 3]
=> nil

hth,

brian

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