Quick example of the new Dio gem, https://www.github.com/baweaver/dio

dio_quick_example.rb

require 'dio'

# Dive into arbitrary objects using their methods
Dio[1] in { succ: { succ: { succ: 4 } } }
# => true

Node = Struct.new(:value, :children)

tree = Node[1,
  Node[2, Node[3, Node[4]]],
  Node[5],
  Node[6, Node[7], Node[8]]
]

# Dive into nested structures with no concept
# of pattern matching
Dio[tree] in {
  value:,
  children: [*, { value: 5 }, *]
}
# => true