Add solution #2185

Author: JoshCrozier

README.md

@@ -372,6 +372,7 @@
 2114|[Maximum Number of Words Found in Sentences](./2114-maximum-number-of-words-found-in-sentences.js)|Easy|
 2129|[Capitalize the Title](./2129-capitalize-the-title.js)|Easy|
 2154|[Keep Multiplying Found Values by Two](./2154-keep-multiplying-found-values-by-two.js)|Easy|
+2185|[Counting Words With a Given Prefix](./2185-counting-words-with-a-given-prefix.js)|Easy|
 2215|[Find the Difference of Two Arrays](./2215-find-the-difference-of-two-arrays.js)|Easy|
 2235|[Add Two Integers](./2235-add-two-integers.js)|Easy|
 2244|[Minimum Rounds to Complete All Tasks](./2244-minimum-rounds-to-complete-all-tasks.js)|Medium|

solutions/2185-counting-words-with-a-given-prefix.js

@@ -0,0 +1,20 @@
+/**
+ * 2185. Counting Words With a Given Prefix
+ * https://leetcode.com/problems/counting-words-with-a-given-prefix/
+ * Difficulty: Easy
+ *
+ * You are given an array of strings words and a string pref.
+ *
+ * Return the number of strings in words that contain pref as a prefix.
+ *
+ * A prefix of a string s is any leading contiguous substring of s.
+ */
+
+/**
+ * @param {string[]} words
+ * @param {string} pref
+ * @return {number}
+ */
+var prefixCount = function(words, pref) {
+  return words.filter(word => word.startsWith(pref)).length;
+};