deepCopy functions creates a clones instance of an object

deep-copy.js

export const deepCopy = (obj) => {
  let copy;

  // Handle the 3 simple types, and null or undefined
  if (null == obj || 'object' !== typeof obj) {
    return obj;
  }

  // Handle Date
  if (obj instanceof Date) {
    copy = new Date();
    copy.setTime(obj.getTime());
    return copy;
  }

  // Handle Array
  if (obj instanceof Array) {
    copy = [];
    for (let i = 0, len = obj.length; i < len; i++) {
      copy[i] = deepCopy(obj[i]);
    }
    return copy;
  }

  // Handle Object
  if (obj instanceof Object) {
    copy = {};
    for (const attr in obj) {
      if (obj.hasOwnProperty(attr)) {
        copy[attr] = deepCopy(obj[attr]);
      }
      ;
    }
    return copy;
  }

  throw new Error(`Unable to copy obj! Its type isn't supported.`);
};