feat: enable new langs (#42491)

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curriculum/challenges/italian/10-coding-interview-prep/rosetta-code/leap-year.md

@@ -0,0 +1,79 @@
+---
+id: 5a23c84252665b21eecc7ede
+title: Leap year
+challengeType: 5
+forumTopicId: 302300
+dashedName: leap-year
+---
+
+# --description--
+
+Determine whether a given year is a leap year in the Gregorian calendar.
+
+# --hints--
+
+`isLeapYear` should be a function.
+
+```js
+assert(typeof isLeapYear == 'function');
+```
+
+`isLeapYear()` should return a boolean.
+
+```js
+assert(typeof isLeapYear(2018) == 'boolean');
+```
+
+`isLeapYear(2018)` should return `false`.
+
+```js
+assert.equal(isLeapYear(2018), false);
+```
+
+`isLeapYear(2016)` should return `true`.
+
+```js
+assert.equal(isLeapYear(2016), true);
+```
+
+`isLeapYear(2000)` should return `true`.
+
+```js
+assert.equal(isLeapYear(2000), true);
+```
+
+`isLeapYear(1900)` should return `false`.
+
+```js
+assert.equal(isLeapYear(1900), false);
+```
+
+`isLeapYear(1996)` should return `true`.
+
+```js
+assert.equal(isLeapYear(1996), true);
+```
+
+`isLeapYear(1800)` should return `false`.
+
+```js
+assert.equal(isLeapYear(1800), false);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function isLeapYear(year) {
+
+}
+```
+
+# --solutions--
+
+```js
+function isLeapYear(year) {
+  return year % 100 === 0 ? year % 400 === 0 : year % 4 === 0;
+}
+```