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

Question

I'm looking for a better way to do

if hash.key? :a &&    hash.key? :b &&    hash.key? :c &&    hash.key? :d 

preferably something like

hash.includes_keys? [ :a, :b, :c, :d ]  

I came up with

hash.keys & [:a, :b, :c, :d] == [:a, :b, :c, :d] 

but I dont like having to add the array twice though

Answer 1

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