Select from a list of values where arbitrary conditions are met

callable_conditions.rb

def has_foo?
  ->(thing) { thing == "foo" }
end

def has_bar?
  ->(thing) { thing == "bar" }
end

def has_baz?
  ->(thing) { thing == "baz" }
end

if __FILE__ == $0
  conditions = [has_foo?, has_bar?, has_baz?]

  result = ["foo", "baz", "uq_", "bar"].select do |thing|
    conditions.any? { |condition| condition.call(thing) }
  end

  puts result
end

$ ruby callable_conditions.rb
foo
baz
bar