Have a look at the JavaScript Console for output

Code:

const people = [{
  name: 'Wes',
  year: 1988,
},
{
  name: 'Kait',
  year: 1986,
},
{
  name: 'Irv',
  year: 1970,
},
{
  name: 'Lux',
  year: 2015,
},
];

const comments = [{
  text: 'Love this!',
  id: 523423,
},
{
  text: 'Super good',
  id: 823423,
},
{
  text: 'You are the best',
  id: 2039842,
},
{
  text: 'Ramen is my fav food ever',
  id: 123523,
},
{
  text: 'Nice Nice Nice!',
  id: 542328,
},
];

// Some and Every Checks
// Array.prototype.some() // is at least one person 19 or older?
const isAdult = people.some((person) => {
  const currentYear = new Date().getFullYear();
  return (currentYear - person.year) >= 19;
});
console.log(isAdult);

// Array.prototype.every() // is everyone 19 or older?
const allAdults = people.every((person) => {
  const currentYear = new Date().getFullYear();
  return (currentYear - person.year) >= 19;
});
console.log(allAdults);

// Array.prototype.find()
// Find is like filter, but instead returns just the one you are looking for
// find the comment with the ID of 823423
const comment = comments.find(c => c.id === 823423);
console.log(comment);

// Array.prototype.findIndex()
// Find the comment with this ID
// delete the comment with the ID of 823423
const index = comments.findIndex(c => c.id === 823423);
comments.splice(index, 1);
console.table(comments);