to_h

        # Struct.to_h

(from ruby core)
---
    to_h -> hash
    to_h {|name, value| ... } -> hash

---

Returns a hash containing the name and value for each member:

    Customer = Struct.new(:name, :address, :zip)
    joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
    h = joe.to_h
    h # => {:name=>"Joe Smith", :address=>"123 Maple, Anytown NC", :zip=>12345}

If a block is given, it is called with each name/value pair; the block
should return a 2-element array whose elements will become a key/value
pair in the returned hash:

    h = joe.to_h{|name, value| [name.upcase, value.to_s.upcase]}
    h # => {:NAME=>"JOE SMITH", :ADDRESS=>"123 MAPLE, ANYTOWN NC", :ZIP=>"12345"}

Raises ArgumentError if the block returns an inappropriate value.