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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 nativeClass = require( '@stdlib/utils/native-class' );
var Object = require( '@stdlib/object/ctor' );
var getProto = require( './proto.js' );
// MAIN //
/**
* Returns the prototype of a provided object.
*
* @private
* @param {Object} obj - input object
* @returns {(Object|null)} prototype
*/
function getPrototypeOf( obj ) {
var proto = getProto( obj );
if ( proto || proto === null ) {
return proto;
}
if ( nativeClass( obj.constructor ) === '[object Function]' ) {
// May break if the constructor has been tampered with...
return obj.constructor.prototype;
}
if ( obj instanceof Object ) {
return Object.prototype;
}
// Return `null` for objects created via `Object.create( null )`. Also return `null` for cross-realm objects on browsers that lack `__proto__` support, such as IE < 11.
return null;
}
// EXPORTS //
module.exports = getPrototypeOf;
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