p Enumerable.instance_methods.sort
# => ["all?", "any?", "collect", "detect", "each_with_index", "entries",
# => "find", "find_all", "grep", "include?", "inject", "map", "max",
# => "member?", "min", "partition", "reject", "select", "sort", "sort_by",
# => "to_a", "zip"]