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

instance method

StringIO#internal_encoding

strio.internal_encoding => encoding

Returns the Encoding of the internal string if conversion is specified. Otherwise returns nil.

See also #gets #isatty #getc #length also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0