[Sdruby] checking items in array for same class

[Tom Werner]

Sounds like a good chance to pull that functionality out into a function 
for reuse:

class Array
  def all_elements_are?(klass)
    self.inject(true) { |same, n| same && n.instance_of?(klass) }
  end
end

a = ['foo', 'bar', 'baz']
a.all_elements_are?(String)     #=> true

b = ['foo', 5, 'baz']
b.all_elements_are?(String)     #=> false

Tom



Chris Abad wrote:
> anyone know of a better way to make sure all items in an array are 
> instances of the same class? specifically i want to make sure they're 
> all instances of the same AR class.
>
> This just doesn't seem the best way:
>
> def method
>   object_class = array.first.class
>   array.each do | record |
>     raise ArgumentError unless record.class == object_class
>   end
> end
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-- 
Tom Werner
Helmets to Hardhats
Software Developer
tom at helmetstohardhats.org
www.helmetstohardhats.org