JavaScript / TypeScript-对象仅分配可用属性

Question

Following usecase: Lets assume I have an object with following properties:

const objOne = {
  car: 'ford',
  location: 'Munich',
  driver: 'John'
}

and a second Obj that only has some of the first Obj's properties:

const objTwo = {
  car: 'BMW',
  driver: 'Marta'
}

Is there a way to assign the properties from the second obj to the first obj without loosing the properties from the first obj. In this case location: 'Munich' . I know for a fact there is a method like Object.assign but this method completely copies the targeted obj, which I obviously don't want to.

Answer 1

This is exactly the behaviour of Object.assign

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

 const objOne = { car: 'ford', location: 'Munich', driver: 'John' } const objTwo = { car: 'BMW', driver: 'Marta' } console.log(objOne); console.log(objTwo); Object.assign(objOne, objTwo); console.log('--assign--'); console.log(objOne);