validate.js (1787B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive; 24 var isnan = require( '@stdlib/assert/is-nan' ); 25 26 27 // MAIN // 28 29 /** 30 * Validates parameters. 31 * 32 * @private 33 * @param {number} a - minimum support 34 * @param {number} b - maximum support 35 * @param {number} c - mode 36 * @returns {(Error|null)} error or null 37 * 38 * @example 39 * var err = validate( 1.0, 2.0, 1.3 ); 40 * if ( err ) { 41 * throw err; 42 * } 43 */ 44 function validate( a, b, c ) { 45 if ( !isNumber( a ) || isnan( a ) ) { 46 return new TypeError( 'invalid argument. First argument must be a number primitive and not `NaN`. Value: `'+a+'`.' ); 47 } 48 if ( !isNumber( b ) || isnan( b ) ) { 49 return new TypeError( 'invalid argument. Second argument must be a number primitive and not `NaN`. Value: `'+b+'`.' ); 50 } 51 if ( !isNumber( c ) || isnan( c ) ) { 52 return new TypeError( 'invalid argument. Third argument must be a number primitive and not `NaN`. Value: `'+c+'`.' ); 53 } 54 if ( !(a <= c && c <= b) ) { 55 return new RangeError( 'invalid arguments. The condition `a <= c <= b` must be satisfied. Value: `['+a+','+b+','+c+']`.'); 56 } 57 return null; 58 } 59 60 61 // EXPORTS // 62 63 module.exports = validate;