feat(2022): add challenge 12

Author: borjapazr

2022/challenge-12/README.md

@@ -0,0 +1,40 @@
+# Electric sleighs, wow!
+
+## 🔢 Instructions
+
+Santa Claus has new electric sleighs but he must control the electricity consumption because **he only has a 20W battery**.
+
+We are given an **array of sleighs, from worst to best**, with their respective consumptions. Each sleigh is an object with two properties: `name` and `consumption`.
+
+The `consumption` field is a number that represents the amount of watts (W) that **consumes** the sleigh for each **distance unit**. The `name` field is a string that represents the sleigh name.
+
+Create a program that returns the name of the best sleigh available that allows us to cover the distance.
+
+```javascript
+const distance = 30;
+const sleighs = [
+  { name: 'Gorusuke', consumption: 0.3 },
+  { name: 'Madeval', consumption: 0.5 },
+  { name: 'Lolivier', consumption: 0.7 },
+  { name: 'Hyuuh', consumption: 1 }
+];
+
+selectSleigh(distance, sleighs); // => "Madeval"
+
+// Gorusuke consumes 9W to cover 30 distance
+// Madeval consumes 15W to cover 30 distance
+// Lolivier consumes 21W to cover 30 distance
+// Hyuuh consumes 30W to cover 30 distance
+
+// The best sleigh to cover the distance is Madeval.
+
+// Gorusuke covers the distance but it's a worse sleigh
+// Lolivier and Hyuuh can't cover the distance with 20W.
+```
+
+**Remember that**:
+
+- The battery is always 20W.
+- The list of sleighs is ordered from worst to best sleigh.
+- You have to return the name of the best sleigh that allows us to cover the distance with the watts we have available.
+- If no sleigh can be used, then return `null`.

2022/challenge-12/solution.js

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+const selectSleigh = (distance, sleighs) => {
+  const eligibleSleighs = sleighs.filter(sleigh => {
+    return sleigh.consumption * distance <= 20;
+  });
+
+  return eligibleSleighs.length > 0 ? eligibleSleighs.at(-1).name : null;
+};
+
+const selectSleighAlt = (distance, sleighs) => {
+  const eligibleSleighs = sleighs.filter(sleigh => {
+    return sleigh.consumption * distance <= 20;
+  });
+
+  eligibleSleighs.unshift({ name: null, consumption: Infinity });
+
+  return eligibleSleighs.at(-1).name;
+};
+
+export { selectSleigh, selectSleighAlt };

2022/challenge-12/solution.spec.js

@@ -0,0 +1,70 @@
+import { selectSleigh, selectSleighAlt } from './solution';
+
+describe('Challenge 12: Electric sleighs, wow!', () => {
+  describe('selectSleigh(...)', () => {
+    const testCases = [
+      createTestCase(
+        [
+          1,
+          [
+            { name: 'pheralb', consumption: 0.3 },
+            { name: 'TMChein', consumption: 0.5 }
+          ]
+        ],
+        'TMChein',
+        'should return the name of the sleigh with the lowest consumption (1)'
+      ),
+      createTestCase(
+        [
+          10,
+          [
+            { name: 'Pedrosillano', consumption: 1 },
+            { name: 'SamarJaffal', consumption: 5 }
+          ]
+        ],
+        'Pedrosillano',
+        'should return the name of the sleigh with the lowest consumption (2)'
+      ),
+      createTestCase(
+        [
+          10,
+          [
+            { name: 'Pedrosillano', consumption: 1 },
+            { name: 'SamarJaffal', consumption: 2 },
+            { name: 'marcospage', consumption: 3 }
+          ]
+        ],
+        'SamarJaffal',
+        'should return the name of the sleigh with the lowest consumption (3)'
+      ),
+      createTestCase(
+        [
+          50,
+          [
+            { name: 'Pedrosillano', consumption: 1 },
+            { name: 'SamarJaffal', consumption: 2 },
+            { name: 'marcospage', consumption: 3 }
+          ]
+        ],
+        null,
+        'should return null if no sleigh can be used'
+      )
+    ];
+
+    it('#T should return a string', () => {
+      const distance = 10;
+      const sleighs = [
+        { name: 'Pedrosillano', consumption: 1 },
+        { name: 'SamarJaffal', consumption: 2 },
+        { name: 'marcospage', consumption: 3 }
+      ];
+      expect(typeof selectSleigh(distance, sleighs)).toBe('string');
+      expect(typeof selectSleighAlt(distance, sleighs)).toBe('string');
+    });
+
+    it.each(testCases)('#$# $description', ({ args, expected }) => {
+      expect(selectSleigh(...args)).toEqual(expected);
+      expect(selectSleighAlt(...args)).toEqual(expected);
+    });
+  });
+});

README.md

@@ -68,6 +68,7 @@ This repository contains the solutions to the challenges proposed by [@midudev](
 | 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) |
+| 12  |          [Electric sleighs, wow!](2022/challenge-12)          |       🟠       | [Show](2022/challenge-12/solution.js) |
 
 [^1]: **Difficulty**: 🟢 Easy 🟠 Medium 🔴 Hard 🟣 Very Hard