Add solution #1207

Author: JoshCrozier

solutions/1207-unique-number-of-occurrences.js

@@ -3,19 +3,17 @@
  * https://leetcode.com/problems/unique-number-of-occurrences/
  * Difficulty: Easy
  *
- * Given an array of integers arr, write a
- * function that returns true if and only
- * if the number of occurrences of each
- * value in the array is unique.
+ * Given an array of integers arr, return true if the number of occurrences of each
+ * value in the array is unique or false otherwise.
  */
 
 /**
- * @param {number[]} numbers
+ * @param {number[]} arr
  * @return {boolean}
  */
-var uniqueOccurrences = function(numbers) {
+var uniqueOccurrences = function(arr) {
   const map = new Map();
-  numbers.forEach(n => map.set(n, map.has(n) ? map.get(n) + 1 : 1));
+  arr.forEach(n => map.set(n, map.has(n) ? map.get(n) + 1 : 1));
   const occurrences = Array.from(map.values());
-  return new Set(occurrences).size === occurrences.length
+  return new Set(occurrences).size === occurrences.length;
 };