hash

        # Struct.hash

(from ruby core)
---
    hash -> integer

---

Returns the integer hash value for `self`.

Two structs of the same class and with the same content will have the
same hash code (and will compare using Struct#eql?):

    Customer = Struct.new(:name, :address, :zip)
    joe    = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
    joe_jr = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
    joe.hash == joe_jr.hash # => true
    joe_jr[:name] = 'Joe Smith, Jr.'
    joe.hash == joe_jr.hash # => false

Related: Object#hash.