Create deep copy with recursive method

deepCopyRecursion.js

//recursive method to create deep copy
function deepCopy(obj) {
  
  if (null === obj || 'object' !== typeof obj) return obj;
    
  switch (obj.constructor) {
    case Boolean:
      return new Boolean(obj);
    case Number:
      return new Number(obj);
    case String:
      return new String(obj);
    case Date:
      return new Date().setTime(obj.getTime());
    case Array:
      return obj.map((o) => deepCopy1(o));
    case RegExp:
      return new RegExp(obj);
    case BigInt:
      return BigInt(obj);
    case Object: {
      let copy = {};
      Object.keys(obj).forEach((key) => {
        if (obj.hasOwnProperty(key)) copy[key] = deepCopy1(obj[key]);
      });
      return copy;
    }
  }
  return obj;
}