ES6 Filter, Sort, Map method chaining

method-chaining.js

/* PRINT OUT TO THE CONSOLE,
  AN ORDERED LIST OF "ACTIVE" USERS,
  BY ASENDING SURNAME (ie A, B, C),
  WITH A STRING SHOWING USERS FULL NAME AND AGE TO WHOLE NUMBER
  ie
  "Jerry Brie is 80 years old."
  "Mickey Jacobs is 92 years old."
  "Tom Oswalt is 80 years old."
*/

const USERS = [
  { name: "Troy Barnes", dob: "1989-12-04", active: false },
  { name: "Abed Nadir", dob: "1979-03-24", active: true },
  { name: "Jeff Winger", dob: "1974-11-20", active: true },
  { name: "Pierce Hawthorne", dob: "1944-11-27", active: false },
  { name: "Annie Edison", dob: "1990-12-19", active: true },
  { name: "Britta Perry", dob: "1980-10-19", active: true },
  { name: "Shirley Bennett", dob: "1971-08-12", active: false },
  { name: "Professor Professorson", dob: "1969-03-27", active: false },
  { name: "Craig Pelton", dob: "1971-07-15", active: true },
];

//calculate age from dob
const getAge = (birthDate) =>
  Math.floor((new Date() - new Date(birthDate).getTime()) / 3.15576e10);

/**
 *
 * Chained methods= [
 *  filter active users,
 *  then sort users by their las name,
 *  then console log result
 * ]
 *
*/
const sortActiveUsersByLastName = (users) => {
  users
    .filter((user) => user.active === true)
    .sort((a, b) => (a.name.split(" ")[1] > b.name.split(" ")[1] ? 1 : -1))
    .map((user) => {
      const dob = getAge(user.dob);
      console.log(`${user.name} is ${dob} years old `);
    });
};

//call the function
sortActiveUsersByLastName(USERS);

/**
 * Should output,
 * Annie Edison is 29 years old,
 * Abed Nadir is 41 years old,
 * Craig Pelton is 48 years old,
 * Britta Perry is 39 years old,
 * Jeff Winger is 45 years old,
 */