GenerateOtherArrayWithReduce.js

const initialArray = [
  {
     name: 'Ricardo',
     surname: 'Luz',
     age: 32
  },
  {
    name: 'John',
    surname: 'Doe',
    age: 40
  }
];

const endArray = initialArray.reduce(
	(accumulator, value) => [
     ...accumulator,
    {
        fullName: `${value.name} ${value.surname}`,
        age: value.age
    }
	],
  []
);