function getName(person) {
  return person.name;
}

const getName = person => person.name;

function sayHello(name) {
  if (name === undefined) {
    name = 'person';
  }
  
  console.log('Hello ' + name + '!');
}

const sayHello = (name = 'person') => {
    console.log(`Hello ${name}`);
};

function getFullName(person) {
  var firstName = person.firstName;
  var lastName = person.lastName;
  return firstName + ' ' + lastName;
}

const getFullName = ({ firstName, lastName }) => {
    return `${firstName} ${lastName}`;
};

var items = [1, 2, 3, 4, 5];
var first = items[0];
var second = items[1];
var third = items[2];

const items = [1, 2, 3, 4, 5];

const [first, second, third] = items;

function combine(obj, overrides) {
  return Object.assign({}, obj, overrides);
}

const combine = (original, overrides) => { 
  return {
    ...original, 
    ...overrides, 
  };
};

const getAllButOne = obj => {
  const { care, ...importantBits };
  return importantBits;
};

function addFirst(item, list) {
  return [item].concat(list);
}

const addFirst = (item, list) => ([item, ...list]);

const allButFirst = list => {
  const [first, ...rest] = list;
  return rest;
}