higherOrderArrays.js

var ages = [33, 12, 20, 16, 5, 54, 21, 44, 61, 13, 15, 45, 25, 64, 32];
var companies = [
  { name: "Company One", category: "Finance", start: 1981, end: 2004 },
  { name: "Company Two", category: "Retail", start: 1992, end: 2008 },
  { name: "Company Three", category: "Auto", start: 1999, end: 2007 },
  { name: "Company Four", category: "Retail", start: 1989, end: 2010 },
  { name: "Company Five", category: "Technology", start: 2009, end: 2014 },
  { name: "Company Six", category: "Finance", start: 1987, end: 2010 },
  { name: "Company Seven", category: "Auto", start: 1986, end: 1996 },
  { name: "Company Eight", category: "Technology", start: 2011, end: 2016 },
  { name: "Company Nine", category: "Retail", start: 1981, end: 1989 },
];
//ForEach
companies.forEach((company) => console.log(company));
//Filter
var retail = companies.filter(function (companyName) {
  return companyName.category === "retail";
});
//Map
var companyName = companies.map(function (company) {
  return company.name;
});
//Sort
var sortDate = companies.sort(function (c1, c2) {
  return c1.start > c2.start ? 1 : 0;
});
//Reduce
var sum = ages.reduce(function (total, age) {
  return total + age;
}, 0);
console.log(sum);