✔️ exercise findTheOldest

JavaScript/javascript-exercises/12_findTheOldest/findTheOldest.js

@@ -1,6 +1,19 @@
-const findTheOldest = function() {
-
+const findTheOldest = function (array) {
+  return array.reduce((oldest, currentPerson) => {
+    const oldestAge = getAge(oldest.yearOfBirth, oldest.yearOfDeath);
+    const currentAge = getAge(
+      currentPerson.yearOfBirth,
+      currentPerson.yearOfDeath
+    );
+    return oldestAge < currentAge ? currentPerson : oldest;
+  });
 };
 
+const getAge = function (birth, death) {
+  if (!death) {
+    death = new Date().getFullYear();
+  }
+  return death - birth;
+};
 // Do not edit below this line
 module.exports = findTheOldest;

JavaScript/javascript-exercises/12_findTheOldest/findTheOldest.spec.js

@@ -1,7 +1,7 @@
-const findTheOldest = require('./findTheOldest')
+const findTheOldest = require("./findTheOldest");
 
-describe('findTheOldest', () => {
-  test('finds the person with the greatest age!', () => {
+describe("findTheOldest", () => {
+  test("finds the person with the greatest age!", () => {
     const people = [
       {
         name: "Carly",
@@ -18,10 +18,10 @@ describe('findTheOldest', () => {
         yearOfBirth: 1912,
         yearOfDeath: 1941,
       },
-    ]
-    expect(findTheOldest(people).name).toBe('Ray');
+    ];
+    expect(findTheOldest(people).name).toBe("Ray");
   });
-  test.skip('finds the oldest person if yearOfDeath field is undefined on a non-oldest person', () => {
+  test("finds the oldest person if yearOfDeath field is undefined on a non-oldest person", () => {
     const people = [
       {
         name: "Carly",
@@ -37,10 +37,10 @@ describe('findTheOldest', () => {
         yearOfBirth: 1912,
         yearOfDeath: 1941,
       },
-    ]
-    expect(findTheOldest(people).name).toBe('Ray');
+    ];
+    expect(findTheOldest(people).name).toBe("Ray");
   });
-  test.skip('finds the oldest person if yearOfDeath field is undefined for the oldest person', () => {
+  test("finds the oldest person if yearOfDeath field is undefined for the oldest person", () => {
     const people = [
       {
         name: "Carly",
@@ -56,7 +56,7 @@ describe('findTheOldest', () => {
         yearOfBirth: 1912,
         yearOfDeath: 1941,
       },
-    ]
-    expect(findTheOldest(people).name).toBe('Carly');
+    ];
+    expect(findTheOldest(people).name).toBe("Carly");
   });
 });