add leap exercise

config.json

@@ -55,6 +55,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "leap",
+        "name": "Leap",
+        "uuid": "473f85b9-c74e-4c6f-91a0-003b370bff5c",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "two-fer",
         "name": "Two-Fer",

exercises/practice/leap/.docs/instructions.md

@@ -0,0 +1,3 @@
+# Instructions
+
+Your task is to determine whether a given year is a leap year.

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

@@ -0,0 +1,16 @@
+# Introduction
+
+A leap year (in the Gregorian calendar) occurs:
+
+- In every year that is evenly divisible by 4.
+- Unless the year is evenly divisible by 100, in which case it's only a leap year if the year is also evenly divisible by 400.
+
+Some examples:
+
+- 1997 was not a leap year as it's not divisible by 4.
+- 1900 was not a leap year as it's not divisible by 400.
+- 2000 was a leap year!
+
+~~~~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/leap/.gitignore

@@ -0,0 +1,2 @@
+node_modules
+**/*.res.js

exercises/practice/leap/.meta/Leap.res

@@ -0,0 +1 @@
+let isLeapYear = year => year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)

exercises/practice/leap/.meta/Leap.resi

@@ -0,0 +1 @@
+let isLeapYear: int => bool

exercises/practice/leap/.meta/config.json

@@ -0,0 +1,23 @@
+{
+  "authors": [
+    "therealowenrees"
+  ],
+  "files": {
+    "solution": [
+      "src/Leap.res"
+    ],
+    "test": [
+      "tests/Leap_test.res"
+    ],
+    "example": [
+      ".meta/Leap.res",
+      ".meta/Leap.resi"
+    ],
+    "editor": [
+      "src/Leap.resi"
+    ]
+  },
+  "blurb": "Determine whether a given year is a leap year.",
+  "source": "CodeRanch Cattle Drive, Assignment 3",
+  "source_url": "https://web.archive.org/web/20240907033714/https://coderanch.com/t/718816/Leap"
+}

exercises/practice/leap/.meta/testTemplate.js

@@ -0,0 +1,19 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { assertEqual } from "../../../../test_generator/assertions.js";
+import { generateTests } from '../../../../test_generator/testGenerator.js';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const slug = path.basename(path.resolve(__dirname, '..'))
+
+// EDIT THIS WITH YOUR ASSERTIONS
+export const assertionFunctions = [ assertEqual ]
+
+// EDIT THIS WITH YOUR TEST TEMPLATES
+export const template = (c) => {
+  const { year } = c.input
+
+  return `assertEqual(~message="${c.description}", isLeapYear(${year}), ${c.expected})`
+}
+
+generateTests(__dirname, slug, assertionFunctions, template)

exercises/practice/leap/.meta/tests.toml

@@ -0,0 +1,37 @@
+# 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.
+
+[6466b30d-519c-438e-935d-388224ab5223]
+description = "year not divisible by 4 in common year"
+
+[ac227e82-ee82-4a09-9eb6-4f84331ffdb0]
+description = "year divisible by 2, not divisible by 4 in common year"
+
+[4fe9b84c-8e65-489e-970b-856d60b8b78e]
+description = "year divisible by 4, not divisible by 100 in leap year"
+
+[7fc6aed7-e63c-48f5-ae05-5fe182f60a5d]
+description = "year divisible by 4 and 5 is still a leap year"
+
+[78a7848f-9667-4192-ae53-87b30c9a02dd]
+description = "year divisible by 100, not divisible by 400 in common year"
+
+[9d70f938-537c-40a6-ba19-f50739ce8bac]
+description = "year divisible by 100 but not by 3 is still not a leap year"
+
+[42ee56ad-d3e6-48f1-8e3f-c84078d916fc]
+description = "year divisible by 400 is leap year"
+
+[57902c77-6fe9-40de-8302-587b5c27121e]
+description = "year divisible by 400 but not by 125 is still a leap year"
+
+[c30331f6-f9f6-4881-ad38-8ca8c12520c1]
+description = "year divisible by 200, not divisible by 400 in common year"

exercises/practice/leap/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 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.