feat(2022): add challenge 11

Author: borjapazr

2022/challenge-11/README.md

@@ -0,0 +1,28 @@
+# Santa Claus is Scrum Master
+
+## 🔢 Instructions
+
+Santa Claus is a bit worried because the preparations are taking a long time. He has got a Scrum certification and has decided to use the Scrum methodology to organize the work of his elves.
+
+The elfs tell him the expected duration of the tasks with a string with the format `hh:mm:ss` and in the same format how long they have been working on it.
+
+But Santa Claus does not get quickly if there is too much or too little left to finish, so he has asked us to make a program that tells us what portion of the task has already been completed.
+
+For example, if the task lasts `03:00:00` and they have been working for `01:00:00` then they have already completed `1/3` of the task. In code:
+
+```javascript
+getCompleted('01:00:00', '03:00:00'); // '1/3'
+getCompleted('02:00:00', '04:00:00'); // '1/2'
+getCompleted('01:00:00', '01:00:00'); // '1/1'
+getCompleted('00:10:00', '01:00:00'); // '1/6'
+getCompleted('01:10:10', '03:30:30'); // '1/3'
+getCompleted('03:30:30', '05:50:50'); // '3/5
+```
+
+**Note**:
+
+- The time format is `hh:mm:ss`.
+- The output format is a string `a/b` where a is the portion of the task that has already been completed and b is the portion of the task that is left to complete.
+- The portion is always shown with the smallest fraction possible. (for example, `2/4` will never be shown because it can be represented as `1/2`).
+- If the task has already been completed, the fraction would be `1/1`.
+- No elf has been mistreated during the execution of this challenge nor have they had to use Scrum for real.

2022/challenge-11/solution.js

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+const getCompleted = (part, total) => {
+  const [hoursPart, minutesPart, secondsPart] = part.split(':');
+  const [hoursTotal, minutesTotal, secondsTotal] = total.split(':');
+
+  const partSeconds = (+hoursPart * 60 + +minutesPart) * 60 + +secondsPart;
+  const totalSeconds = (+hoursTotal * 60 + +minutesTotal) * 60 + +secondsTotal;
+
+  const calculateGreatestCommonDivisor = (a, b) => {
+    while (b) {
+      const t = b;
+      b = a % b;
+      a = t;
+    }
+    return a;
+  };
+
+  const gcd = calculateGreatestCommonDivisor(partSeconds, totalSeconds);
+
+  const numerator = partSeconds / gcd;
+  const denominator = totalSeconds / gcd;
+
+  return `${numerator}/${denominator}`;
+};
+
+export { getCompleted };

2022/challenge-11/solution.spec.js

@@ -0,0 +1,23 @@
+import { getCompleted } from './solution';
+
+describe('Challenge 11: Santa Claus is Scrum Master', () => {
+  describe('getCompleted(...)', () => {
+    const testCases = [
+      createTestCase(['01:00:00', '03:00:00'], '1/3'),
+      createTestCase(['02:00:00', '04:00:00'], '1/2'),
+      createTestCase(['01:00:00', '01:00:00'], '1/1'),
+      createTestCase(['00:10:00', '01:00:00'], '1/6'),
+      createTestCase(['01:10:10', '03:30:30'], '1/3'),
+      createTestCase(['02:20:20', '03:30:30'], '2/3'),
+      createTestCase(['03:30:30', '05:50:50'], '3/5')
+    ];
+
+    it('#T should return a string', () => {
+      expect(typeof getCompleted('01:00:00', '03:00:00')).toBe('string');
+    });
+
+    it.each(testCases)('#$# should return $expected when the input is $args.0', ({ args, expected }) => {
+      expect(getCompleted(...args)).toEqual(expected);
+    });
+  });
+});

README.md

@@ -67,6 +67,7 @@ This repository contains the solutions to the challenges proposed by [@midudev](
 | 08  |           [We need a mechanic!](2022/challenge-08)            |       🟠       | [Show](2022/challenge-08/solution.js) |
 | 09  |            [Crazy Xmas lights](2022/challenge-09)             |       🟢       | [Show](2022/challenge-09/solution.js) |
 | 10  |       [The Santa Claus sleigh jump](2022/challenge-10)        |       🟠       | [Show](2022/challenge-10/solution.js) |
+| 11  |       [Santa Claus is Scrum Master](2022/challenge-11)        |       🔴       | [Show](2022/challenge-11/solution.js) |
 
 [^1]: **Difficulty**: 🟢 Easy 🟠 Medium 🔴 Hard 🟣 Very Hard