---
description: reverse() 一行結束
---

# # 344 Reverse String

[LeetCode](https://leetcode.com/problems/reverse-string/)

```
Write a function that reverses a string. 
The input string is given as an array of characters char[].

Do not allocate extra space for another array, 
you must do this by modifying the input array in-place with O(1) extra memory.

You may assume all the characters consist of printable ascii characters.
```

```
Example 1:

Input: ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

Example 2:

Input: ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]
rotate 2 steps to the right: [3,99,-1,-100]

/**
 * @param {character[]} s
 * @return {void} Do not return anything, modify s in-place instead.
 */
var reverseString = function(s) {};
```

### Edge Case

有像 $% 這種符號嗎

````javascript
var reverseString = function(s) {
    return s.reverse();
};


var reverseString = function(s) {
  let start = 0
  let end = s.length - 1
   while(end > start){
        [s[start], s[end]] = [s[end], s[start]]
        start ++
        end --
    }
}
```
````
