End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Kconv.issjis

Kconv.issjis(str) => true or false

# File tmp/rubies/ruby-3.1.3/ext/nkf/lib/kconv.rb, line 165
def issjis(str)
  str.dup.force_encoding(SJIS).valid_encoding?
end

Returns whether input encoding is Shift_JIS or not.

See also #issjis .isjis .isutf8 .iseuc also in 3.3 · 3.2 · 3.0