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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 isObject = require( '@stdlib/assert/is-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var getPrototypeOf = require( '@stdlib/utils/get-prototype-of' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var nativeClass = require( '@stdlib/utils/native-class' );
// VARIABLES //
var objectPrototype = Object.prototype;
// FUNCTIONS //
/**
* Tests that an object only has own properties.
*
* @private
* @param {Object} obj - value to test
* @returns {boolean} boolean indicating if an object only has own properties
*/
function ownProps( obj ) {
var key;
// NOTE: possibility of perf boost if key enumeration order is known (see http://stackoverflow.com/questions/18531624/isplainobject-thing).
for ( key in obj ) {
if ( !hasOwnProp( obj, key ) ) {
return false;
}
}
return true;
}
// MAIN //
/**
* Tests if a value is a plain object.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether value is a plain object
*
* @example
* var bool = isPlainObject( {} );
* // returns true
*
* @example
* var bool = isPlainObject( null );
* // returns false
*/
function isPlainObject( value ) {
var proto;
// Screen for obvious non-objects...
if ( !isObject( value ) ) {
return false;
}
// Objects with no prototype (e.g., `Object.create( null )`) are plain...
proto = getPrototypeOf( value );
if ( !proto ) {
return true;
}
// Objects having a prototype are plain if and only if they are constructed with a global `Object` function and the prototype points to the prototype of a plain object...
return (
// Cannot have own `constructor` property:
!hasOwnProp( value, 'constructor' ) &&
// Prototype `constructor` property must be a function (see also https://bugs.jquery.com/ticket/9897 and http://stackoverflow.com/questions/18531624/isplainobject-thing):
hasOwnProp( proto, 'constructor' ) &&
isFunction( proto.constructor ) &&
nativeClass( proto.constructor ) === '[object Function]' &&
// Test for object-specific method:
hasOwnProp( proto, 'isPrototypeOf' ) &&
isFunction( proto.isPrototypeOf ) &&
(
// Test if the prototype matches the global `Object` prototype (same realm):
proto === objectPrototype ||
// Test that all properties are own properties (cross-realm; *most* likely a plain object):
ownProps( value )
)
);
}
// EXPORTS //
module.exports = isPlainObject;
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