instance method · added in Ruby 4.0

Binding#implicit_parameters

binding.implicit_parameters → Array

static VALUE
bind_implicit_parameters(VALUE bindval)
{
    const rb_binding_t *bind;
    const rb_env_t *env;

    GetBindingPtr(bindval, bind);
    env = VM_ENV_ENVVAL_PTR(vm_block_ep(&bind->block));

    if (get_local_variable_ptr(&env, idItImplicit, FALSE)) {
        return rb_ary_new_from_args(1, ID2SYM(idIt));
    }

    env = VM_ENV_ENVVAL_PTR(vm_block_ep(&bind->block));
    return rb_vm_env_numbered_parameters(env);
}

Returns the names of numbered parameters and “it” parameter that are defined in the binding.

Example

def foo
  [42].each do
    it
    binding.implicit_parameters #=> [:it]
  end

  { k: 42 }.each do
    _2
    binding.implicit_parameters #=> [:_1, :_2]
  end
end

Ruby version changes

4.0
- Binding#implicit_parameters, Binding#implicit_parameter_get, and Binding#implicit_parameter_defined? have been added to access numbered parameters and “it” parameter. [Bug #21049]

See also #implicit_parameter_get #local_variable_defined? #implicit_parameter_defined? #local_variable_get also in 4.1

‹ prev#implicit_parameter_get next ›#local_variable_defined?