End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

IO::generic_writable#printf

strio.printf(format_string [, obj, ...] ) → nil

ext/stringio/stringio.c View on GitHub ↗

#define strio_printf rb_io_printf

See also #print #puts #<< #write_nonblock also in 3.4 · 3.3 · 3.1 · 3.0