Count the Number of Vowel Strings in Range

# 2586. Count the Number of Vowel Strings in Range

You are given a 0-indexed array of string words and two integers left and right.

A string is called a vowel string if it starts with a vowel character and ends with a vowel character where vowel characters are ‘a’, ‘e’, ‘i’, ‘o’, and ‘u’.

Return the number of vowel strings words[i] where i belongs to the inclusive range [left, right].

### Example 1:
```
Input: words = ["are","amy","u"], left = 0, right = 2
Output: 2
Explanation: 
- "are" is a vowel string because it starts with 'a' and ends with 'e'.
- "amy" is not a vowel string because it does not end with a vowel.
- "u" is a vowel string because it starts with 'u' and ends with 'u'.
The number of vowel strings in the mentioned range is 2.
```

### Example 2:
```
Input: words = ["hey","aeo","mu","ooo","artro"], left = 1, right = 4
Output: 3
Explanation: 
- "aeo" is a vowel string because it starts with 'a' and ends with 'o'.
- "mu" is not a vowel string because it does not start with a vowel.
- "ooo" is a vowel string because it starts with 'o' and ends with 'o'.
- "artro" is a vowel string because it starts with 'a' and ends with 'o'.
The number of vowel strings in the mentioned range is 3.
 ```

Constraints:
```
1 <= words.length <= 1000
1 <= words[i].length <= 10
words[i] consists of only lowercase English letters.
0 <= left <= right < words.length
```

/**
 * @param {string[]} words
 * @param {number} left
 * @param {number} right
 * @return {number}
 */
var vowelStrings = function(words, left, right) {
    const vowels = 'aeiou';
    let count = 0;
    for (let i = left; i <= right; i++) {
        if (vowels.includes(words[i][0]) && vowels.includes(words[i].at(-1))) {
            count++;
        }
    }
    return count;
};