JS tricks

jstricks.js

const getUser = emailIncluded => ({
    name: 'dead',
    surname: 'kff01',
    ...(emailIncluded ? { email : '[email protected]' } : null)
})

console.log(getUser(true))

// destructuring
const rawUser = {
   name: 'dead',
   surname: 'kff',
   email: '[email protected]',
   displayName: 'SuperCoolDead',
   joined: '2016-05-05',
   image: 'path-to-the-image',
   followers: 45
}

let user = {}, userDetails = {};
({ name: user.name, surname: user.surname, ...userDetails } = rawUser)

console.log(user) 
console.log(userDetails)

// merging an array of objects into one
const cities = [
    { name: 'Paris', visited: 'no' },
    { name: 'Lyon', visited: 'no' },
    { name: 'Marseille', visited: 'yes' },
    { name: 'Rome', visited: 'yes' },
    { name: 'Milan', visited: 'no' },
    { name: 'Palermo', visited: 'yes' },
    { name: 'Genoa', visited: 'yes' },
    { name: 'Berlin', visited: 'no' },
    { name: 'Hamburg', visited: 'yes' },
    { name: 'New York', visited: 'yes' }
];

const result = cities.reduce((accumulator, item) => ({
    ...accumulator,
    [item.name]: item.visited
  }), {})

/*
const cityNames = Array.from(cities, ({ name }) => name);

const result = cities.reduce((accumulator, item) => {
  accumulator[item.name] = item.visited;
  return accumulator;
}, {});
*/
console.log(result);