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+---
+id: 5a23c84252665b21eecc8016
+title: Sort using a custom comparator
+challengeType: 5
+---
+
+## Description
+<section id='description'>
+Write a function to sort an array (or list) of strings in order of descending length, and in ascending lexicographic order for strings of equal length.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+## Tests
+<section id='tests'>
+
+``` yml
+tests:
+  - text: <code>lengthSorter</code> should be a function.
+    testString: assert(typeof lengthSorter == 'function', '<code>lengthSorter</code> should be a function.');
+  - text: <code>lengthSorter(["Here", "are", "some", "sample", "strings", "to", "be", "sorted"])</code> should return a array.
+    testString: assert(Array.isArray(lengthSorter(["Here", "are", "some", "sample", "strings", "to", "be", "sorted"])), '<code>lengthSorter(["Here", "are", "some", "sample", "strings", "to", "be", "sorted"])</code> should return a array.');
+  - text: <code>lengthSorter(["Here", "are", "some", "sample", "strings", "to", "be", "sorted"])</code> should return <code>["strings", "sample", "sorted", "Here", "some", "are", "be", "to"]</code>.
+    testString: assert.deepEqual(lengthSorter(["Here", "are", "some", "sample", "strings", "to", "be", "sorted"]), ["strings", "sample", "sorted", "Here", "some", "are", "be", "to"], '<code>lengthSorter(["Here", "are", "some", "sample", "strings", "to", "be", "sorted"])</code> should return <code>["strings", "sample", "sorted", "Here", "some", "are", "be", "to"]</code>.');
+  - text: <code>lengthSorter(["I", "hope", "your", "day", "is", "going", "good", "?"])</code> should return <code>["going", "good", "hope", "your", "day", "is", "?","I"]</code>.
+    testString: assert.deepEqual(lengthSorter(["I", "hope", "your", "day", "is", "going", "good", "?"]), ["going", "good", "hope", "your", "day", "is", "?","I"], '<code>lengthSorter(["I", "hope", "your", "day", "is", "going", "good", "?"])</code> should return <code>["going", "good", "hope", "your", "day", "is", "?","I"]</code>.');
+  - text: <code>lengthSorter(["Mine", "is", "going", "great"])</code> should return <code>["going", "great", "Mine", "is"]</code>.
+    testString: assert.deepEqual(lengthSorter(["Mine", "is", "going", "great"]), ["going", "great", "Mine", "is"], '<code>lengthSorter(["Mine", "is", "going", "great"])</code> should return <code>["going", "great", "Mine", "is"]</code>.');
+  - text: <code>lengthSorter(["Have", "fun", "sorting", "!!"])</code> should return <code>["sorting", "Have", "fun", "!!"]</code>.
+    testString: assert.deepEqual(lengthSorter(["Have", "fun", "sorting", "!!"]), ["sorting", "Have", "fun", "!!"], '<code>lengthSorter(["Have", "fun", "sorting", "!!"])</code> should return <code>["sorting", "Have", "fun", "!!"]</code>.');
+  - text: <code>lengthSorter(["Everthing", "is", "good", "!!"])</code> should return <code>["Everthing", "good", "!!", "is"]</code>.
+    testString: assert.deepEqual(lengthSorter(["Everthing", "is", "good", "!!"]), ["Everthing", "good", "!!", "is"], '<code>lengthSorter(["Everthing", "is", "good", "!!"])</code> should return <code>["Everthing", "good", "!!", "is"]</code>.');
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+<div id='js-seed'>
+
+```js
+function lengthSorter (arr) {
+  // Good luck!
+}
+```
+
+</div>
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+function lengthSorter(arr) {
+    arr.sort(function (a, b) {
+        var result = b.length - a.length;
+        if (result == 0)
+            result = a.localeCompare(b);
+        return result;
+    })
+    return arr;
+}
+```
+
+</section>