CODEWITHSUNDEEP
javascripttypescriptobjectecmascript-6
MarcoLe
MarcoLe

Reputation: 2509

JavaScript/TypeScript - Object assign only available properties

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.

Upvotes: 4

Views: 2419

Answers (1)

knee pain
knee pain

Reputation: 620

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);

Upvotes: 7

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