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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 defineProperty = require( '@stdlib/utils/define-property' );
var format = require( '@stdlib/string/format' );
var validate = require( './validate.js' );
var createObject = require( './detect.js' );
// MAIN //
/**
* Implements prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.
*
* ## Notes
*
* - This implementation is not designed to work with ES2015/ES6 classes. For ES2015/ES6 classes, use `class` with `extends`.
* - For reference, see [node#3455](https://github.com/nodejs/node/pull/3455), [node#4179](https://github.com/nodejs/node/issues/4179), [node#3452](https://github.com/nodejs/node/issues/3452), and [node commit](https://github.com/nodejs/node/commit/29da8cf8d7ab8f66b9091ab22664067d4468461e#diff-3deb3f32958bb937ae05c6f3e4abbdf5).
*
* @param {(Object|Function)} ctor - constructor which will inherit
* @param {(Object|Function)} superCtor - super (parent) constructor
* @throws {TypeError} first argument must be either an object or a function which can inherit
* @throws {TypeError} second argument must be either an object or a function from which a constructor can inherit
* @throws {TypeError} second argument must have an inheritable prototype
* @returns {(Object|Function)} child constructor
*
* @example
* function Foo() {
* return this;
* }
* Foo.prototype.beep = function beep() {
* return 'boop';
* };
*
* function Bar() {
* Foo.call( this );
* return this;
* }
* inherit( Bar, Foo );
*
* var bar = new Bar();
* var v = bar.beep();
* // returns 'boop'
*/
function inherit( ctor, superCtor ) {
var err = validate( ctor );
if ( err ) {
throw err;
}
err = validate( superCtor );
if ( err ) {
throw err;
}
if ( typeof superCtor.prototype === 'undefined' ) {
throw new TypeError( format( 'invalid argument. Second argument must have a prototype from which another object can inherit. Value: `%s`.', superCtor.prototype ) );
}
// Create a prototype which inherits from the parent prototype:
ctor.prototype = createObject( superCtor.prototype );
// Set the constructor to refer to the child constructor:
defineProperty( ctor.prototype, 'constructor', {
'configurable': true,
'enumerable': false,
'writable': true,
'value': ctor
});
return ctor;
}
// EXPORTS //
module.exports = inherit;
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