Count the Number of Vowels in a String
Write a function named countVowels that takes one parameter: str. The function should return the number of vowels (a, e, i, o, u) present in the string. Both uppercase and lowercase vowels should be counted.
Example 1
Input: countVowels("hello");
Output: 2
Example 2
Input: countVowels("JavaScript");
Output: 3
Example 3
Input: countVowels("OpenAI");
Output: 3
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