8000 add findOldest Solutions · M-Munk/javascript-exercises@ffa0027 · GitHub
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add findOldest Solutions
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‎findTheOldest/README.md

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# Find the Oldest
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given an array of objects representing people with a birth and death year, return the oldest person.
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## Hints
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- You should return the whole person object, but the tests mostly just check to make sure the name is correct.
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- this can be done with a couple of chained array methods, or by using `reduce`.
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- One of the tests checks for people with no death-date.. use JavaScript's Date function to get their age as of today.
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‎findTheOldest/findTheOldest.js

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const findTheOldest = function(array) {
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return array.reduce((oldest, currentPerson) => {
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const oldestAge = getAge(oldest.yearOfBirth, oldest.yearOfDeath)
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const currentAge = getAge(currentPerson.yearOfBirth, currentPerson.yearOfDeath)
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return oldestAge < currentAge ? currentPerson : oldest
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})
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}
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const getAge = function(birth, death) {
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if (!death) {
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death = new Date().getFullYear();
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}
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return death - birth;
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}
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module.exports = findTheOldest

‎findTheOldest/findTheOldest.spec.js

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let findTheOldest = require('./findTheOldest')
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describe('findTheOldest', function() {
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it('finds the oldest person!', function() {
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const people = [
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{
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name: 'Carly',
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yearOfBirth: 1942,
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yearOfDeath: 1970,
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},
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{
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name: 'Ray',
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yearOfBirth: 1962,
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yearOfDeath: 2011
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},
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{
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name: 'Jane',
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yearOfBirth: 1912,
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yearOfDeath: 1941
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},
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]
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expect(findTheOldest(people).name).toEqual('Ray');
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});
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it('finds the oldest person if someone is still living', function() {
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const people = [
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{
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name: 'Carly',
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yearOfBirth: 2018,
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},
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{
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name: 'Ray',
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yearOfBirth: 1962,
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yearOfDeath: 2011
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},
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{
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name: 'Jane',
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yearOfBirth: 1912,
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yearOfDeath: 1941
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},
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]
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expect(findTheOldest(people).name).toEqual('Ray');
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});
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it('finds the oldest person if the OLDEST is still living', function() {
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const people = [
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{
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name: 'Carly',
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yearOfBirth: 1066,
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},
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{
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name: 'Ray',
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yearOfBirth: 1962,
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yearOfDeath: 2011
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},
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{
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name: 'Jane',
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yearOfBirth: 1912,
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yearOfDeath: 1941
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},
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]
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expect(findTheOldest(people).name).toEqual('Carly');
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});
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});
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