Deep copying objects in Angular

Question

AngularJS has angular.copy() to deep copy objects and arrays.

Does Angular also have something like that?

Answer 1

Some modifications for KrishnamrajuK's answer

export class DeepCopy {
  static copy(data: any, objMap?: WeakMap) {
    if (!objMap) {
      // Map for handle recursive objects
      objMap = new WeakMap();
    }

    // recursion wrapper
    const deeper = value => {
      if (value && typeof value === 'object') {
        return DeepCopy.copy(value, objMap);
      }
      return value;
    };

    // Array value
    if (Array.isArray(data)) return data.map(deeper);

    // Object value
    if (data && typeof data === 'object') {
      // Same object seen earlier
      if (objMap.has(data)) return objMap.get(data);
      // Date object
      if (data instanceof Date) {
        const result = new Date(data.valueOf());
        objMap.set(data, result);
        return result;
      }
      // Use original prototype
      const node = Object.create(Object.getPrototypeOf(data));
      // Save object to map before recursion
      objMap.set(data, node);
      for (const [key, value] of Object.entries(data)) {
        node[key] = deeper(value);
      }
      return node;
    }
    // Scalar value
    return data;
  }
}