howOld.js

/* 
Our solution is written as a function expression and uses string interpolation, but it would be equally acceptable to use a function declaration and/or string concatenation
*/

const howOld = (age, year) => {
  // The following two lines make it so that our function always knows the current year.
  let dateToday = new Date();
  let thisYear = dateToday.getFullYear();
  // It is totally ok if your function used the current year directly!
  //   console.log(thisYear);
  const yearDifference = year - thisYear;
  const newAge = age + yearDifference;
  //   console.log(newAge);
  if (newAge < 0) {
    return `The year ${year} was ${-newAge} years before you were born`;
  } else if (newAge > age) {
    return `You will be ${newAge} in the year ${year}`;
  } else {
    return `You were ${newAge} in the year ${year}`;
  }
};
console.log(howOld(31, 1990));