Module#module_exec

mod.module_exec(arg...) {|var...| block } → obj

static VALUE
rb_mod_module_exec_internal(int argc, const VALUE *argv, VALUE mod)
{
    return yield_under(mod, FALSE, argc, argv, RB_PASS_CALLED_KEYWORDS);
}

Evaluates the given block in the context of the class/module. The method defined in the block will belong to the receiver. Any arguments passed to the method will be passed to the block. This can be used if the block needs to access instance variables.

Example

class Thing
end
Thing.class_exec{
  def hello() "Hello there!" end
}
puts Thing.new.hello()

produces:

Example

Hello there!

See also #module_eval #module_function #method_undefined #name also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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