text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 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';
  
  // MODULES //
  
  var isnan = require( '@stdlib/math-base-assert-is-nan' );
  
  
  // MAIN //
  
  /**
  * Returns the excess kurtosis for a Laplace distribution with location `mu` and scale `b`.
  *
  * @param {number} mu - location parameter
  * @param {PositiveNumber} b - scale parameter
  * @returns {number} kurtosis
  *
  * @example
  * var y = kurtosis( 0.0, 1.0 );
  * // returns 3.0
  *
  * @example
  * var y = kurtosis( 5.0, 2.0 );
  * // returns 3.0
  *
  * @example
  * var y = kurtosis( NaN, 1.0 );
  * // returns NaN
  *
  * @example
  * var y = kurtosis( 0.0, NaN );
  * // returns NaN
  *
  * @example
  * var y = kurtosis( 0.0, 0.0 );
  * // returns NaN
  */
  function kurtosis( mu, b ) {
  	if (
  		isnan( mu ) ||
  		isnan( b ) ||
  		b <= 0.0
  	) {
  		return NaN;
  	}
  	return 3.0;
  }
  
  
  // EXPORTS //
  
  module.exports = kurtosis;
  