76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isObject = require( '@stdlib/assert/is-plain-object' );
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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var indexOf = require( './../../index-of' );
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// VARIABLES //
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var returns = [ 'values', 'keys', '*' ];
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// MAIN //
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/**
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* Validates function options.
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*
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* @private
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* @param {Object} opts - destination object
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* @param {Options} options - function options
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* @param {*} [options.thisArg] - execution context
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* @param {string} [options.returns] - output format
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* @returns {(Error|null)} null or an error object
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*
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* @example
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* var opts = {};
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* var options = {
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* 'returns': '*',
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* 'thisArg': {}
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* };
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* var err = validate( opts, options );
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* if ( err ) {
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* throw err;
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* }
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*/
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function validate( opts, options ) {
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if ( !isObject( options ) ) {
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return new TypeError( 'invalid argument. Options must be an object. Value: `' + options + '`.' );
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}
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if ( hasOwnProp( options, 'thisArg' ) ) {
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opts.thisArg = options.thisArg;
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}
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if ( hasOwnProp( options, 'returns' ) ) {
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opts.returns = options.returns;
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if ( indexOf( returns, opts.returns ) === -1 ) {
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return new TypeError( 'invalid option. `returns` option must be one of the following: "' + returns.join( '", "' ) + '". Option: `' + opts.returns + '`.' );
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}
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}
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return null;
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}
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// EXPORTS //
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module.exports = validate;
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