adding-a-property-to-an-object.js

const basePerson = {
  firstName: "Max"
};

const condition = getCondition()
const result = condition && { lastName: "" };
// Can be either false or { lastName: "" }

const person = {
  ...basePerson,
  ...result
};
// Can be { firstName: "Max" } or { firstName: "Max", lastName: "" }