exercism · ErikSchierboom · Jun 29, 2025 · Jun 29, 2025
diff --git a/config.json b/config.json
@@ -28,6 +28,18 @@
       ".meta/examplar.fut"
     ]
   },
+  "exercises": {
+    "practice": [
+      {
+        "slug": "leap",
+        "name": "Leap",
+        "uuid": "f47fb89b-1226-4318-bb36-1c5c02b8d38a",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
+      }
+    ]
+  },
   "tags": [
     "execution_mode/compiled",
     "paradigm/array",

diff --git a/exercises/practice/leap/.docs/instructions.md b/exercises/practice/leap/.docs/instructions.md
@@ -0,0 +1,3 @@
+# Instructions
+
+Your task is to determine whether a given year is a leap year.
diff --git a/exercises/practice/leap/.docs/introduction.md b/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).
+~~~~
diff --git a/exercises/practice/leap/.meta/config.json b/exercises/practice/leap/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "leap.fut"
+    ],
+    "test": [
+      "test.fut"
+    ],
+    "example": [
+      ".meta/example.fut"
+    ]
+  },
+  "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"
+}
diff --git a/exercises/practice/leap/.meta/example.fut b/exercises/practice/leap/.meta/example.fut
@@ -0,0 +1,2 @@
+def is_leap (year: i32): bool =
+  year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
diff --git a/exercises/practice/leap/.meta/tests.toml b/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"
diff --git a/exercises/practice/leap/leap.fut b/exercises/practice/leap/leap.fut
@@ -0,0 +1 @@
+def is_leap (year: i32): bool = ???
diff --git a/exercises/practice/leap/test.fut b/exercises/practice/leap/test.fut
@@ -0,0 +1,49 @@
+import "leap"
+
+-- Year not divisible by 4 in common year
+-- ==
+-- input { 2015 }
+-- output { false }
+
+-- Year divisible by 2, not divisible by 4 in common year
+-- ==
+-- input { 1970 }
+-- output { false }
+
+-- Year divisible by 4, not divisible by 100 in leap year
+-- ==
+-- input { 1996 }
+-- output { true }
+
+-- Year divisible by 4 and 5 is still a leap year
+-- ==
+-- input { 1960 }
+-- output { true }
+
+-- Year divisible by 100, not divisible by 400 in common year
+-- ==
+-- input { 2100 }
+-- output { false }
+
+-- Year divisible by 100 but not by 3 is still not a leap year
+-- ==
+-- input { 1900 }
+-- output { false }
+
+-- Year divisible by 400 is leap year
+-- ==
+-- input { 2000 }
+-- output { true }
+
+-- Year divisible by 400 but not by 125 is still a leap year
+-- ==
+-- input { 2400 }
+-- output { true }
+
+-- Year divisible by 200, not divisible by 400 in common year
+-- ==
+-- input { 1800 }
+-- output { false }
+
+let main (year: i32): bool =
+  is_leap year
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		# Instructions

		Your task is to determine whether a given year is a leap year.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		def is_leap (year: i32): bool =
		year % 4 == 0 && (year % 100 != 0 \|\| year % 400 == 0)