add: 检查单词是否为句中其他单词的前缀

README.md

@@ -109,6 +109,10 @@ LeetCode 与 LintCode 解题记录。此为个人练习仓库，代码中对重
   - LeetCode 76. 最小覆盖子串 <https://leetcode-cn.com/problems/minimum-window-substring/>
   - LintCode 32. 最小子串覆盖 <https://www.lintcode.com/problem/minimum-window-substring/description>
 
+- [检查单词是否为句中其他单词的前缀](src/string/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence.js)
+
+  - LeetCode 5416. 检查单词是否为句中其他单词的前缀 <https://leetcode-cn.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence/>
+
 ## 数组/队列/集合/映射
 
 - [电话号码的字母组合](src/array/letter-combinations-of-a-phone-number.js)

src/string/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence.js

@@ -0,0 +1,14 @@
+/**
+ * @param {string} sentence
+ * @param {string} searchWord
+ * @return {number}
+ */
+export const isPrefixOfWord = function (sentence, searchWord) {
+  const items = sentence.split(' ')
+
+  for (const n in items) {
+    if (items[n].indexOf(searchWord) === 0) return Number(n) + 1
+  }
+
+  return -1
+}

test/string/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence.test.js

@@ -0,0 +1,5 @@
+import { isPrefixOfWord } from '../../src/string/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence'
+
+test('检查单词是否为句中其他单词的前缀', () => {
+  expect(isPrefixOfWord('i love eating burger', 'burg')).toBe(4)
+})