Incorrect Return Value for isObject(Object.create(null))

[AciGo]

I encountered unexpected behavior with the isObject function. The expected result when calling isObject(Object.create(null)) is true. However, it is currently returning false.

[shtse8]

The reason is that Object.create(null) creates an object as follows:

{}

However, an empty object should actually look like this:

{
   [[Prototype]]: Object
}

The current implementation checks whether it is a prototype object rather than a plain object. value.constructor === Object

const isObject = (value: any): value is object => {
  return !!value && value.constructor === Object
}

[AciGo]

The reason is that Object.create(null) creates an object as follows:原因是创建一个对象，如下所示：

{}

However, an empty object should actually look like this:但是，空对象实际上应该如下所示：

{
   [[Prototype]]: Object
}

The current implementation checks whether it is a prototype object rather than a plain object. 当前实现检查它是否是原型对象而不是普通对象。value.constructor === Object

const isObject = (value: any): value is object => {
  return !!value && value.constructor === Object
}

I want to check if it's a plain object, what method should I use that you provided?

[shtse8]

Object.create(null) instanceof Object // false

plain object is not an Object. Object is a class instance, while {} is just a plain object in javascript.

so if you want to check if it is an empty object (no matter it is an Object or plain object), simply you can do:

function isEmptyPlainObject(value: any): boolean {
  return typeof value === 'object' // check if it is an plain object, without checking constructor or instance type
    && Object.keys(value).length === 0; // no size
}

I am not the contributors of radash. This project is not active maintaining. I will provide this method in my project xdash. Currently, my utility tool is missing documentation. It contains lots of interesting and effective utilities. Welcome to try.