JavaScript/TypeScript - Restricting to only assigned properties in an object

Question

JavaScript/TypeScript - Restricting to only assigned properties in an object

Consider this scenario: Suppose we have an object with the following properties:

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

and a second object that only contains some of the properties from the first object:

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

Is there a way to merge the properties from the second object into the first object without losing the properties of the first object, such as location: 'Munich'? I am aware of the Object.assign method, but it completely copies the target object, which is not what I want in this case.

javascript typescript object ecmascript-6

Answer 1

Answer №1

This behavior is reminiscent of the Object.assign method

When using the Object.assign() method, it copies the values of all enumerable properties from one or more source objects to a target object. The method then returns 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);

Answer 2

This behavior is reminiscent of the Object.assign method

When using the Object.assign() method, it copies the values of all enumerable properties from one or more source objects to a target object. The method then returns 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);

JavaScript/TypeScript - Restricting to only assigned properties in an object

Answer №1

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