text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2020 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MAIN //
  
  /**
  * Returns the sum.
  *
  * @private
  * @param {number} x - value
  * @param {number} y - value
  * @param {number} z - value
  * @param {number} w - value
  * @returns {number} sum
  */
  function add( x, y, z, w ) {
  	return x + y + z + w;
  }
  
  
  // EXPORTS //
  
  module.exports = add;
  