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Count Vowels in a String

Given a string s, count the number of vowels (a, e, i, o, u) present in it. The comparison should be case-insensitive.

Difficulty:

JavaScript Solution

function countVowels(s) {
  let count = 0;
  const vowels = 'aeiouAEIOU';
  for (let ch of s) {
    if (vowels.includes(ch)) count++;
  }
  return count;
}

Explanation: We iterate through the string and check if each character is a vowel.

⏱ O(n) | 💾 O(1)

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Count Vowels in a String