/**

* @license

* Copyright Google Inc. All Rights Reserved.

*

* Use of this source code is governed by an MIT-style license that can be

* found in the LICENSE file at https://angular.io/license

*/

export function mapObject<T, V>(obj: {[k: string]: T},

mapper: (k: string, v: T) => V): {[k: string]: V} {

return Object.keys(obj).reduce((acc: {[k: string]: V}, k: string) => {

acc[k] = mapper(k, obj[k]);

return acc;

}, {});

}

const copySymbol = Symbol();

// tslint:disable-next-line:no-any

export function deepCopy<T extends any> (value: T): T {

if (Array.isArray(value)) {

return value.map((o: T) => deepCopy(o));

} else if (value && typeof value === 'object') {

if (value[copySymbol]) {

// This is a circular dependency. Just return the cloned value.

return value[copySymbol];

}

if (value['toJSON']) {

return JSON.parse((value['toJSON'] as () => string)());

}

const copy = new (Object.getPrototypeOf(value).constructor)();

value[copySymbol] = copy;

for (const key of Object.getOwnPropertyNames(value)) {

copy[key] = deepCopy(value[key]);

}

value[copySymbol] = undefined;

return copy;

} else {

return value;

}

}