Method: Array#to_h_auto

Defined in:
lib/core/facets/to_hash.rb

#to_h_auto ⇒ Object

Converts an array into a hash. Converting an array into a hash is not a one-to-one conversion, for this reason #to_h examines at the array being converted and then dispatches the conversion to the most sutiable specialized function. There are three possiblities for this.

If the array is a collection of perfect pairs, like that which Hash#to_a generates, then conversion is handled by #to_h_flat.

a = [ [:a,1], [:b,2] ]
a.to_h_auto  #=> { :a=>1, :b=>2 }

If the array contains only arrays, but are not perfect pairs, then #to_h_multi is called.

a = [ [:a,1,2], [:b,2], [:c], [:d] ]
a.to_h_auto  #=> { :a=>[1,2], :b=>[2], :c=>[], :d=>[] }

If the array contians objects other then arrays then the #to_h_splat method is called.

a = [ [:a,1,2], 2, :b, [:c,3], 9 ]
a.to_h_auto  #=> { [:a,1,2]=>2, :b=>[:c,3], 9=>nil }



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# File 'lib/core/facets/to_hash.rb', line 91

def to_h_auto
  pairs = true
  mixed = false

  each do |e|
    case e
    when Array
      pairs = false if e.size > 2
    else
      mixed = true
    end
  end

  if mixed
    to_h_splat
  elsif pairs
    to_h_flat
  else
    to_h_multi
  end
end