End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
String#issjis
String#issjis => true or false
ext/nkf/lib/kconv.rb
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# File tmp/rubies/ruby-3.0.5/ext/nkf/lib/kconv.rb, line 270
def issjis; Kconv.issjis(self) end
Returns whether self‘s encoding is Shift_JIS or not.