#1455 - Check If a Word Occurs As a Prefix of Any Word in a Sentence

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Problem Description

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.

Solution

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