运算符

new

function isObject(value) {
  const type = typeof value;
  return (type === 'object' && value !== null) || type === 'function';
}

function newOperator(func, ...args) {
  if (typeof func !== 'function') {
    throw new TypeError(`${func} is not a constructor`);
  }
  const proto = func.prototype;
  if (!checkObjectType(proto)) {
    proto = Object.prototype;
  }
  const obj = Object.create(proto);
  const ret = func.apply(obj, args);
  return checkObjectType(ret) ? ret : obj;
}