Add prime-factors exercise

config.json

@@ -442,6 +442,14 @@
         "prerequisites": [],
         "difficulty": 7
       },
+      {
+        "slug": "prime-factors",
+        "name": "Prime Factors",
+        "uuid": "128fe5f7-a49e-4c90-a874-ef24bd74388a",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 7
+      },
       {
         "slug": "saddle-points",
         "name": "Saddle Points",

exercises/practice/prime-factors/.docs/instructions.md

@@ -0,0 +1,36 @@
+# Instructions
+
+Compute the prime factors of a given natural number.
+
+A prime number is only evenly divisible by itself and 1.
+
+Note that 1 is not a prime number.
+
+## Example
+
+What are the prime factors of 60?
+
+- Our first divisor is 2.
+  2 goes into 60, leaving 30.
+- 2 goes into 30, leaving 15.
+  - 2 doesn't go cleanly into 15.
+    So let's move on to our next divisor, 3.
+- 3 goes cleanly into 15, leaving 5.
+  - 3 does not go cleanly into 5.
+    The next possible factor is 4.
+  - 4 does not go cleanly into 5.
+    The next possible factor is 5.
+- 5 does go cleanly into 5.
+- We're left only with 1, so now, we're done.
+
+Our successful divisors in that computation represent the list of prime factors of 60: 2, 2, 3, and 5.
+
+You can check this yourself:
+
+```text
+2 * 2 * 3 * 5
+= 4 * 15
+= 60
+```
+
+Success!

exercises/practice/prime-factors/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "prime-factors.ua"
+    ],
+    "test": [
+      "tests.ua"
+    ],
+    "example": [
+      ".meta/example.ua"
+    ]
+  },
+  "blurb": "Compute the prime factors of a given natural number.",
+  "source": "The Prime Factors Kata by Uncle Bob",
+  "source_url": "https://web.archive.org/web/20221026171801/http://butunclebob.com/ArticleS.UncleBob.ThePrimeFactorsKata"
+}

exercises/practice/prime-factors/.meta/example.ua

@@ -0,0 +1 @@
+Factors ← °/×

exercises/practice/prime-factors/.meta/tests.toml

@@ -0,0 +1,46 @@
+# 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.
+
+[924fc966-a8f5-4288-82f2-6b9224819ccd]
+description = "no factors"
+
+[17e30670-b105-4305-af53-ddde182cb6ad]
+description = "prime number"
+
+[238d57c8-4c12-42ef-af34-ae4929f94789]
+description = "another prime number"
+
+[f59b8350-a180-495a-8fb1-1712fbee1158]
+description = "square of a prime"
+
+[756949d3-3158-4e3d-91f2-c4f9f043ee70]
+description = "product of first prime"
+
+[bc8c113f-9580-4516-8669-c5fc29512ceb]
+description = "cube of a prime"
+
+[7d6a3300-a4cb-4065-bd33-0ced1de6cb44]
+description = "product of second prime"
+
+[073ac0b2-c915-4362-929d-fc45f7b9a9e4]
+description = "product of third prime"
+
+[6e0e4912-7fb6-47f3-a9ad-dbcd79340c75]
+description = "product of first and second prime"
+
+[00485cd3-a3fe-4fbe-a64a-a4308fc1f870]
+description = "product of primes and non-primes"
+
+[02251d54-3ca1-4a9b-85e1-b38f4b0ccb91]
+description = "product of primes"
+
+[070cf8dc-e202-4285-aa37-8d775c9cd473]
+description = "factors include a large prime"

exercises/practice/prime-factors/prime-factors.ua

@@ -0,0 +1,3 @@
+# Get a number's prime factors
+# Factors | Number
+Factors ← |1 ⊙(⍤ "Please implement Factors" 0)

exercises/practice/prime-factors/tests.ua

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+~ "prime-factors.ua" ~ Factors
+
+# No factors
+⍤⤙≍ [] Factors 1
+
+# Prime number
+⍤⤙≍ [2] Factors 2
+
+# Another prime number
+⍤⤙≍ [3] Factors 3
+
+# Square of a prime
+⍤⤙≍ [3 3] Factors 9
+
+# Product of first prime
+⍤⤙≍ [2 2] Factors 4
+
+# Cube of a prime
+⍤⤙≍ [2 2 2] Factors 8
+
+# Product of second prime
+⍤⤙≍ [3 3 3] Factors 27
+
+# Product of third prime
+⍤⤙≍ [5 5 5 5] Factors 625
+
+# Product of first and second prime
+⍤⤙≍ [2 3] Factors 6
+
+# Product of primes and non-primes
+⍤⤙≍ [2 2 3] Factors 12
+
+# Product of primes
+⍤⤙≍ [5 17 23 461] Factors 901255
+
+# Factors include a large prime
+⍤⤙≍ [11 9539 894119] Factors 93819012551