End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
String#isjis
String#isjis => true or false
ext/nkf/lib/kconv.rb
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# File tmp/rubies/ruby-3.1.3/ext/nkf/lib/kconv.rb, line 276
def isjis; Kconv.isjis(self) end
Returns whether self‘s encoding is ISO-2022-JP or not.