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

class method

Module.new

Module.new → mod

Module.new {|mod| block } → mod

static VALUE
rb_mod_initialize(VALUE module)
{
    return rb_mod_initialize_exec(module);
}

Creates a new anonymous module. If a block is given, it is passed the module object, and the block is evaluated in the context of this module like module_eval.

Example

fred = Module.new do
  def meth1
    "hello"
  end
  def meth2
    "bye"
  end
end
a = "my string"
a.extend(fred)   #=> "my string"
a.meth1          #=> "hello"
a.meth2          #=> "bye"

Assign the module to a constant (name starting uppercase) if you want to treat it like a regular module.

See also .nesting .used_modules .constants #< also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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