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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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isEnumerableProperty = require( '@stdlib/assert/is-enumerable-property' );
var isArray = require( '@stdlib/assert/is-array' );
var isInteger = require( '@stdlib/math/base/assert/is-integer' );
var MAX_LENGTH = require( '@stdlib/constants/uint32/max' );
// MAIN //
/**
* Tests whether a value is an `arguments` object.
*
* @private
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether a value is an `arguments` object
*
* @example
* function foo() {
* return arguments;
* }
*
* var bool = isArguments( foo() );
* // returns true
*
* @example
* var bool = isArguments( [] );
* // returns false
*/
function isArguments( value ) {
return (
value !== null &&
typeof value === 'object' &&
!isArray( value ) &&
typeof value.length === 'number' &&
isInteger( value.length ) &&
value.length >= 0 &&
value.length <= MAX_LENGTH &&
hasOwnProp( value, 'callee' ) &&
!isEnumerableProperty( value, 'callee' )
);
}
// EXPORTS //
module.exports = isArguments;
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