Given a string s, find the length of the longest substring without repeating characters.

*Example 1:*

```
Input: s = "abcabcbb"
Output: 3
Explanation: The answer is "abc", with the length of 3.
```

*Example 2:*

```
Input: s = "bbbbb"
Output: 1
Explanation: The answer is "b", with the length of 1.
```

*Example 3:*

```
Input: s = "pwwkew"
Output: 3
Explanation: The answer is "wke", with the length of 3.
Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.
```

*Example 4:*

```
Input: s = ""
Output: 0
```

## Solution

```
/**
* @param {string} s
* @return {number}
*/
var lengthOfLongestSubstring = function(s) {
let start = 0, end = 0;
let maxStringLength = 0;
let charSet = new Set();
while (end < s.length) {
if (!charSet.has(s[end])) {
charSet.add(s[end]);
maxStringLength = Math.max(charSet.size, maxStringLength);
end++;
} else {
charSet.delete(s[start]);
start++;
}
}
return maxStringLength;
};
```

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