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# frozen_string_literal: true
class Hash
# Replaces the hash with only the given keys.
# Returns a hash containing the removed key/value pairs.
#
# hash = { a: 1, b: 2, c: 3, d: 4 }
# hash.slice!(:a, :b) # => {:c=>3, :d=>4}
# hash # => {:a=>1, :b=>2}
def slice!(*keys)
omit = slice(*self.keys - keys)
hash = slice(*keys)
hash.default = default
hash.default_proc = default_proc if default_proc
replace(hash)
omit
end
# Removes and returns the key/value pairs matching the given keys.
#
# { a: 1, b: 2, c: 3, d: 4 }.extract!(:a, :b) # => {:a=>1, :b=>2}
# { a: 1, b: 2 }.extract!(:a, :x) # => {:a=>1}
def extract!(*keys)
keys.each_with_object(self.class.new) { |key, result| result[key] = delete(key) if has_key?(key) }
end
end
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