1455-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence.js

/**
 * 1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence
 * https://leetcode.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence/
 * Difficulty: Easy
 *
 * Given a sentence that consists of some words separated by a single space, and a searchWord,
 * check if searchWord is a prefix of any word in sentence.
 *
 * Return the index of the word in sentence (1-indexed) where searchWord is a prefix of this word.
 * If searchWord is a prefix of more than one word, return the index of the first word (minimum index).
 * If there is no such word return -1.
 *
 * A prefix of a string s is any leading contiguous substring of s.
 */

/**
 * @param {string} sentence
 * @param {string} searchWord
 * @return {number}
 */
var isPrefixOfWord = function(sentence, searchWord) {
  return sentence.split(/\s+/).findIndex(s => s.startsWith(searchWord)) + 1 || -1;
};