code: function generate_simple_array (type, length) {
  	type = method.get(type) ? method.get(type).key : default_config.type;
  	length = parseInt(length, 10) || default_config.length;
  	assert.number(length, 'Array length must be a number');
  	return gen[type](length);
  }
docs: console.log(method.get('string').key) 
  generate simple_array
  @return {[type]} return a simple array