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instance method

OptionParser#def_option

def_option(*opts, &block)

# File tmp/rubies/ruby-3.0.5/lib/optparse.rb, line 1512
def define(*opts, &block)
  top.append(*(sw = make_switch(opts, block)))
  sw[0]
end

Alias of #define

See also #define #define_tail #def_tail_option #define_head also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1