https://leetcode.cn/problems/reverse-prefix-of-word/

Author: masx200

README.md

@@ -10,6 +10,8 @@ leetcode 测试
 
 ##### 包含的内容如下
 
+https://leetcode.cn/problems/reverse-prefix-of-word/
+
 https://leetcode.cn/problems/counting-words-with-a-given-prefix/
 
 https://leetcode.cn/problems/maximum-product-difference-between-two-pairs/

reverse-prefix-of-word/index.ts

@@ -0,0 +1,11 @@
+function reversePrefix(word: string, ch: string): string {
+    const index = Array.prototype.findIndex.call(word, (c) => c === ch);
+
+    if (index < 0) return word;
+    return (
+        Array.from(word.slice(0, index + 1))
+            .reverse()
+            .join("") + word.slice(index + 1)
+    );
+}
+export default reversePrefix;