58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
|
/**
|
||
|
|
* @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 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( 'invalid argument. `x0` must be a number primitive and not `NaN`. Value: `' + x0 + '`.' );
|
||
|
|
}
|
||
|
|
if ( !isPositive( gamma ) ) {
|
||
|
|
return new TypeError( 'invalid argument. `gamma` must be a positive number. Value: `' + gamma + '`.' );
|
||
|
|
}
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = validate;
|