Check if a hash's keys include all of a set of keys

%i[a b c d].all? {|s| hash.key? s}

@Mori's way is best, but here's another way:

([:a, :b, :c, :d] - hash.keys).empty?

hash.slice(:a, :b, :c, :d).size == 4

Just in the spirit of TIMTOWTDI, here's another way. If you require 'set' (in the std lib) then you can do this:

Set[:a,:b,:c,:d].subset? hash.keys.to_set

Related