vowelcount.js

function getCount(str) {
  let vowelsCount = 0;
  
  const vowels = {
    a: true,
    e: true,
    i: true,
    o: true,
    u: true,
  }

  for (let i = 0; i < str.length; i++) {
    const currentLetter = str[i]; 

    if (vowels[currentLetter]) {
      vowelsCount++;
    }
  }
    
  return vowelsCount;
}