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instance method

OptionParser#on

on(*params, &block)

# File tmp/rubies/ruby-3.2.0/lib/optparse.rb, line 1550
def on(*opts, &block)
  define(*opts, &block)
  self
end

Creates an option from the given parameters params. See Parameters for New Options.

The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.

See also #new #on_head #make_switch #on_tail also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0

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