aloalgoCount Vowels in a String
Very Easy
You are given a string s containing only lowercase English letters, your task is to return the number of vowels in the string.
The vowels are 'a', 'e', 'i', 'o', and 'u'.
Example 1
Input
"hello"
Output
2
Explanation:
The vowels are 'e' and 'o'.
Example 2
Input
"programming"
Output
3
Explanation:
The vowels are 'o', 'a', and 'i'.
Example 3
Input
"rhythm"
Output
0
Explanation:
There are no vowels in this string.
Input
"hello"
Output
2