index.js

// Given a sentence that consists of some words separated by a single space, and a searchWord.
// You have to check if searchWord is a prefix of any word in sentence.
// Return the index of the word in sentence where searchWord is a prefix of this word(1 - indexed).
// 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.

// Example 1:

// Input: sentence = "i love eating burger", searchWord = "burg"
// Output: 4
// Explanation: "burg" is prefix of "burger" which is the 4th word in the sentence.
// Example 2:

// Input: sentence = "this problem is an easy problem", searchWord = "pro"
// Output: 2
// Explanation: "pro" is prefix of "problem" which is the 2nd and the 6th word in the sentence, but we return 2 as it's the minimal index.
// Example 3:

// Input: sentence = "i am tired", searchWord = "you"
// Output: -1
// Explanation: "you" is not a prefix of any word in the sentence.
// Example 4:

// Input: sentence = "i use triple pillow", searchWord = "pill"
// Output: 4
// Example 5:

// Input: sentence = "hello from the other side", searchWord = "they"
// Output: -1

// Constraints:

// 1 <= sentence.length <= 100
// 1 <= searchWord.length <= 10
// sentence consists of lowercase English letters and spaces.
// searchWord consists of lowercase English letters.

// Solution

const isPrefixOfWord = (sentence, searchWord) => {
    const words = sentence.split(' '), arrLen = words.length, searchLen = searchWord.length;

    for (let i = 0; i < arrLen; i++) {
        if (words[i].substring(0, searchLen) == searchWord) return i + 1
    }
    return -1
};