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* @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 isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
var isPositive = require( '@stdlib/assert/is-positive-number' ).isPrimitive;
var format = require( '@stdlib/string/format' );
var isnan = require( '@stdlib/assert/is-nan' );
// MAIN //
/**
* Validates parameters.
*
* @private
* @param {number} x0 - location parameter
* @param {PositiveNumber} gamma - scale parameter
* @returns {(Error|null)} error or null
*
* @example
* var err = validate( 1.0, 2.5 );
* if ( err ) {
* throw err;
* }
*/
function validate( x0, gamma ) {
if ( !isNumber( x0 ) || isnan( x0 ) ) {
return new TypeError( format( 'invalid argument. First argument must be a number and not NaN. Value: `%s`.', x0 ) );
}
if ( !isPositive( gamma ) ) {
return new TypeError( format( 'invalid argument. Second argument must be a positive number. Value: `%s`.', gamma ) );
}
return null;
}
// EXPORTS //
module.exports = validate;
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