#2185 - Counting Words With a Given Prefix

Easy • View on LeetCode • View on GitHub

Problem Description

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.

Solution

/**
 * @param {string[]} words
 * @param {string} pref
 * @return {number}
 */
var prefixCount = function(words, pref) {
  return words.filter(word => word.startsWith(pref)).length;
};