Object#remove_instance_variable

obj.remove_instance_variable(symbol) → obj

obj.remove_instance_variable(string) → obj

VALUE
rb_obj_remove_instance_variable(VALUE obj, VALUE name)
{
    const ID id = id_for_var(obj, name, an, instance);

    // Frozen check comes here because it's expected that we raise a
    // NameError (from the id_for_var check) before we raise a FrozenError
    rb_check_frozen(obj);

    if (id) {
        VALUE val = rb_ivar_delete(obj, id, Qundef);

        if (val != Qundef) return val;
    }

    rb_name_err_raise("instance variable %1$s not defined",
                      obj, name);
    UNREACHABLE_RETURN(Qnil);
}

Removes the named instance variable from obj, returning that variable’s value. String arguments are converted to symbols.

Example

class Dummy
  attr_reader :var
  def initialize
    @var = 99
  end
  def remove
    remove_instance_variable(:@var)
  end
end
d = Dummy.new
d.var      #=> 99
d.remove   #=> 99
d.var      #=> nil

See also #public_send #respond_to? #public_methods #respond_to_missing? also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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