[eliuds-eggs] Add new practice exercise (#2792)

Author: KasimKaizer

config.json

@@ -1165,6 +1165,19 @@
           "strings"
         ]
       },
+      {
+        "slug": "eliuds-eggs",
+        "name": "Eliud's Eggs",
+        "uuid": "82fb24cc-ac33-4cce-a77a-b59ce3c77832",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 3,
+        "topics": [
+          "bitwise_operations",
+          "integers",
+          "math"
+        ]
+      },
       {
         "slug": "all-your-base",
         "name": "All Your Base",

exercises/practice/eliuds-eggs/.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/eliuds-eggs/.docs/introduction.md

@@ -0,0 +1,65 @@
+# 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
+
+![Seven individual nest boxes arranged in a row whose first, third, fourth and seventh nests each have a single egg.](https://assets.exercism.org/images/exercises/eliuds-eggs/example-1-coop.svg)
+
+```text
+ _ _ _ _ _ _ _
+|E| |E|E| | |E|
+```
+
+### Resulting Binary
+
+![1011001](https://assets.exercism.org/images/exercises/eliuds-eggs/example-1-binary.svg)
+
+```text
+ _ _ _ _ _ _ _
+|1|0|1|1|0|0|1|
+```
+
+### Decimal number on the display
+
+89
+
+### Actual eggs in the coop
+
+4
+
+## Example 2
+
+![Seven individual nest boxes arranged in a row where only the fourth nest has an egg.](https://assets.exercism.org/images/exercises/eliuds-eggs/example-2-coop.svg)
+
+```text
+ _ _ _ _ _ _ _
+| | | |E| | | |
+```
+
+### Resulting Binary
+
+![0001000](https://assets.exercism.org/images/exercises/eliuds-eggs/example-2-binary.svg)
+
+```text
+ _ _ _ _ _ _ _
+|0|0|0|1|0|0|0|
+```
+
+### Decimal number on the display
+
+8
+
+### Actual eggs in the coop
+
+1

exercises/practice/eliuds-eggs/.meta/config.json

@@ -0,0 +1,20 @@
+{
+  "authors": [
+    "KasimKaizer"
+  ],
+  "files": {
+    "solution": [
+      "eliuds_eggs.go"
+    ],
+    "test": [
+      "eliuds_eggs_test.go"
+    ],
+    "example": [
+      ".meta/example.go"
+    ]
+  },
+  "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/eliuds-eggs/.meta/example.go

@@ -0,0 +1,14 @@
+// Package eliudseggs contains an example solution for eliuds-eggs exercise.
+package eliudseggs
+
+// EggCount determines the actual egg count from the displayed value.
+func EggCount(displayValue int) int {
+	count := 0
+	for displayValue > 0 {
+		if (displayValue & 1) == 1 {
+			count++
+		}
+		displayValue >>= 1
+	}
+	return count
+}

exercises/practice/eliuds-eggs/.meta/gen.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"log"
+	"text/template"
+
+	"../../../../gen"
+)
+
+func main() {
+	t, err := template.New("").Parse(tmpl)
+	if err != nil {
+		log.Fatal(err)
+	}
+	var j = map[string]interface{}{
+		"eggCount": &[]testCase{},
+	}
+	if err := gen.Gen("eliuds-eggs", j, t); err != nil {
+		log.Fatal(err)
+	}
+}
+
+type testCase struct {
+	Description string `json:"description"`
+	Input       struct {
+		Number int `json:"number"`
+	} `json:"input"`
+	Expected int `json:"expected"`
+}
+
+// Template to generate various test cases.
+var tmpl = `{{.Header}}
+type testCase struct {
+	description    string
+	input          int
+	expected       int
+}
+
+var testCases = []testCase{
+{{range .J.eggCount}}{
+		description:         {{printf "%q" .Description}},
+		input:               {{.Input.Number}},
+		expected:            {{.Expected}},
+	},{{end}}
+}
+`

exercises/practice/eliuds-eggs/.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/eliuds-eggs/cases_test.go

@@ -0,0 +1,35 @@
+package eliudseggs
+
+// This is an auto-generated file. Do not change it manually. Run the generator to update the file.
+// See https://github.com/exercism/go#synchronizing-tests-and-instructions
+// Source: exercism/problem-specifications
+// Commit: 1a96480 Add `eliuds-eggs` exercise (#2382)
+
+type testCase struct {
+	description string
+	input       int
+	expected    int
+}
+
+var testCases = []testCase{
+	{
+		description: "0 eggs",
+		input:       0,
+		expected:    0,
+	},
+	{
+		description: "1 egg",
+		input:       16,
+		expected:    1,
+	},
+	{
+		description: "4 eggs",
+		input:       89,
+		expected:    4,
+	},
+	{
+		description: "13 eggs",
+		input:       2000000000,
+		expected:    13,
+	},
+}

exercises/practice/eliuds-eggs/eliuds_eggs.go

@@ -0,0 +1,5 @@
+package eliudseggs
+
+func EggCount(displayValue int) int {
+	panic("Please implement the EggCount function")
+}

exercises/practice/eliuds-eggs/eliuds_eggs_test.go

@@ -0,0 +1,22 @@
+package eliudseggs
+
+import "testing"
+
+func TestEggCount(t *testing.T) {
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			got := EggCount(tc.input)
+			if got != tc.expected {
+				t.Fatalf("EggCount(%d) = %d, want: %d", tc.input, got, tc.expected)
+			}
+		})
+	}
+}
+
+func BenchmarkEggCount(b *testing.B) {
+	for range b.N {
+		for _, tc := range testCases {
+			EggCount(tc.input)
+		}
+	}
+}