disemvowel-trolls.js

function disemvowel(str) {
  
  let noVowelStr = '';
  
  for (const letter of str) {
    
    // Determine whether each letter is a vowel
    const lowerCaseLetter = letter.toLowerCase();
    const isVowel = (
      lowerCaseLetter === 'e' || 
      lowerCaseLetter === 'i' || 
      lowerCaseLetter === 'o' || 
      lowerCaseLetter === 'u' || 
      lowerCaseLetter === 'a'
    );
    
    // If not a vowel, add the letter to the output string
    if (!isVowel) {
      noVowelStr += letter;
    }
  }
  
  return noVowelStr;
}