add findOldest Solutions

findTheOldest/README.md

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

findTheOldest/findTheOldest.js

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+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;
+}
+
+module.exports = findTheOldest

findTheOldest/findTheOldest.spec.js

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