How to define a method in ruby using splat and an optional hash at the same time? [duplicate]

Answer 1

In addition to caspers answer:

You may use a splash parameter and check, if the last parameter is a hash. Then you take the hash as settings.

A code example:

def test(id, *ary )
  if ary.last.is_a?(Hash)
    hash_params =   ary.pop
  else
    hash_params =   {}
  end
  # Do stuff here

  puts "#{id}:\t#{ary.inspect}\t#{hash_params.inspect}"
end


test(1, :a, :b )
test(2, :a, :b, :p1 => 1, :p2 => 2 )
test(3, :a,  :p1 => 1, :p2 => 2 )

Result is:

1:  [:a, :b]    {}
2:  [:a, :b]    {:p1=>1, :p2=>2}
3:  [:a]    {:p1=>1, :p2=>2}

This will make problems, if your array-parameter should contain a hash at last position.

test(5, :a,  {:p1 => 1, :p2 => 2} )
test(6, :a,  {:p1 => 1, :p2 => 2}, {} )

Result:

5:  [:a]    {:p1=>1, :p2=>2}
6:  [:a, {:p1=>1, :p2=>2}]  {}