Array of objects to work with:
const people = [ { name: 'Wes', year: 1988 }, { name: 'Kait', year: 1986 }, { name: 'Irv', year: 1970 }, { name: 'Lux', year: 2015 } ];
Array.prototype.some() // is at least one person 19 or older?
const isAdult = people.some(function(person){ const currentYear = new Date().getFullYear(); if(currentYear - person.year >= 19){ return true; } });
refactored with an array function
const isAdult = people.some(person => { return new Date().getFullYear() - person.year >= 19; });
//refactored
const isAdult = people.some(person => new Date().getFullYear() - person.year >= 19);