a string as a parameter and counts the number code example

Example 1: how to make a vowel counter in javascript

function getCount(str) {
let vowelList = 'AEIOUaeiou'
let vowelsCount = 0;

 for(var i = 0; i < str.length ; i++)
  {
    if (vowelList.indexOf(str[i]) !== -1)
    {
      vowelsCount += 1;
    }
  }
  return vowelsCount;
}

Example 2: count vowels in a string javascript

// BEST and FASTER implementation using regex
const countVowels = (str) => (str.match(/[aeiou]/gi) || []).length