[New practice exercise] Pop count

config.json

@@ -2535,6 +2535,14 @@
           "strings"
         ],
         "difficulty": 7
+      },
+      {
+        "slug": "pop-count",
+        "name": "Eliud's Eggs",
+        "uuid": "2a3ecf62-fb5d-4dac-8369-72e7976a8f57",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
       }
     ]
   },

exercises/practice/leap/.docs/introduction.md

@@ -11,6 +11,6 @@ Some examples:
 - 1900 was not a leap year as it's not divisible by 400.
 - 2000 was a leap year!
 
-~~~~exercism/note
+```exercism/note
 For a delightful, four-minute explanation of the whole phenomenon of leap years, check out [this YouTube video](https://www.youtube.com/watch?v=xX96xng7sAE).
-~~~~
+```

exercises/practice/pop-count/.docs/instructions.md

@@ -0,0 +1,8 @@
+# Instructions
+
+Your task is to count the number of 1 bits in the binary representation of a number.
+
+## Restrictions
+
+Keep your hands off that bit-count functionality provided by your standard library!
+Solve this one yourself using other basic tools instead.

exercises/practice/pop-count/.docs/introduction.md

@@ -0,0 +1,47 @@
+# Introduction
+
+Your friend Eliud inherited a farm from her grandma Tigist.
+Her granny was an inventor and had a tendency to build things in an overly complicated manner.
+The chicken coop has a digital display showing an encoded number representing the positions of all eggs that could be picked up.
+
+Eliud is asking you to write a program that shows the actual number of eggs in the coop.
+
+The position information encoding is calculated as follows:
+
+1. Scan the potential egg-laying spots and mark down a `1` for an existing egg or a `0` for an empty spot.
+2. Convert the number from binary to decimal.
+3. Show the result on the display.
+
+Example 1:
+
+```text
+Chicken Coop:
+ _ _ _ _ _ _ _
+|E| |E|E| | |E|
+
+Resulting Binary:
+ 1 0 1 1 0 0 1
+
+Decimal number on the display:
+89
+
+Actual eggs in the coop:
+4
+```
+
+Example 2:
+
+```text
+Chicken Coop:
+ _ _ _ _ _ _ _ _
+| | | |E| | | | |
+
+Resulting Binary:
+ 0 0 0 1 0 0 0 0
+
+Decimal number on the display:
+16
+
+Actual eggs in the coop:
+1
+```

exercises/practice/pop-count/.eslintrc

@@ -0,0 +1,14 @@
+{
+  "root": true,
+  "extends": "@exercism/eslint-config-javascript",
+  "env": {
+    "jest": true
+  },
+  "overrides": [
+    {
+      "files": [".meta/proof.ci.js", ".meta/exemplar.js", "*.spec.js"],
+      "excludedFiles": ["custom.spec.js"],
+      "extends": "@exercism/eslint-config-javascript/maintainers"
+    }
+  ]
+}

exercises/practice/pop-count/.gitignore

@@ -0,0 +1,5 @@
+/node_modules
+/bin/configlet
+/bin/configlet.exe
+/pnpm-lock.yaml
+/yarn.lock

exercises/practice/pop-count/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "Cool-Katt"
+  ],
+  "files": {
+    "solution": [
+      "pop-count.js"
+    ],
+    "test": [
+      "pop-count.spec.js"
+    ],
+    "example": [
+      ".meta/proof.ci.js"
+    ]
+  },
+  "blurb": "Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.",
+  "source": "Christian Willner, Eric Willigers",
+  "source_url": "https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5"
+}

exercises/practice/pop-count/.meta/proof.ci.js

@@ -0,0 +1,5 @@
+export const eggCount = (displayValue) =>
+  [...displayValue.toString(2)].reduce(
+    (acc, curr) => (curr === '1' ? (acc += 1) : acc),
+    0,
+  );

exercises/practice/pop-count/.meta/tests.toml

@@ -0,0 +1,22 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[559e789d-07d1-4422-9004-3b699f83bca3]
+description = "0 eggs"
+
+[97223282-f71e-490c-92f0-b3ec9e275aba]
+description = "1 egg"
+
+[1f8fd18f-26e9-4144-9a0e-57cdfc4f4ff5]
+description = "4 eggs"
+
+[0c18be92-a498-4ef2-bcbb-28ac4b06cb81]
+description = "13 eggs"

exercises/practice/pop-count/.npmrc

@@ -0,0 +1 @@
+audit=false

exercises/practice/pop-count/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Exercism
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

exercises/practice/pop-count/babel.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  presets: ['@exercism/babel-preset-javascript'],
+  plugins: [],
+};

exercises/practice/pop-count/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@exercism/javascript-pop-count",
+  "description": "Exercism practice exercise on pop-count",
+  "author": "Katrina Owen",
+  "contributors": [
+    "Derk-Jan Karrenbeld <derk-jan+git@karrenbeld.info> (https://derk-jan.com)",
+    "Tejas Bubane (https://tejasbubane.github.io/)"
+  ],
+  "private": true,
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/javascript",
+    "directory": "exercises/practice/pop-count"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.23.0",
+    "@exercism/babel-preset-javascript": "^0.2.1",
+    "@exercism/eslint-config-javascript": "^0.6.0",
+    "@types/jest": "^29.5.4",
+    "@types/node": "^20.5.6",
+    "babel-jest": "^29.6.4",
+    "core-js": "~3.32.2",
+    "eslint": "^8.49.0",
+    "jest": "^29.7.0"
+  },
+  "dependencies": {},
+  "scripts": {
+    "test": "jest ./*",
+    "watch": "jest --watch ./*",
+    "lint": "eslint ."
+  }
+}

exercises/practice/pop-count/pop-count.js

@@ -0,0 +1,8 @@
+//
+// This is only a SKELETON file for the 'Poker' exercise. It's been provided as a
+// convenience to get you started writing code faster.
+//
+
+export const eggCount = (displayValue) => {
+  throw new Error('Remove this statement and implement this function');
+};

exercises/practice/pop-count/pop-count.spec.js

@@ -0,0 +1,27 @@
+import { eggCount } from './pop-count';
+
+describe('PopCount', () => {
+  test('0 eggs', () => {
+    const expected = 0;
+    const actual = eggCount(0);
+    expect(actual).toEqual(expected);
+  });
+
+  xtest('1 egg', () => {
+    const expected = 1;
+    const actual = eggCount(16);
+    expect(actual).toEqual(expected);
+  });
+
+  xtest('4 eggs', () => {
+    const expected = 4;
+    const actual = eggCount(89);
+    expect(actual).toEqual(expected);
+  });
+
+  xtest('13 eggs', () => {
+    const expected = 13;
+    const actual = eggCount(2000000000);
+    expect(actual).toEqual(expected);
+  });
+});