const input = 'dude whats up yo'; const vowels = ['a', 'e', 'i', 'u', 'o']; let resultArray = []; for (let i=0; i< input.length; i++){ /* prints each item in array console.log(input[i]); prints index of each item in array console.log(i); */ for(let j=0; j<vowels.length; j++){ if(input[i]===vowels[j]){ if(input[i]==='e'){ resultArray.push('ee') } else if (input[i]==='u'){ resultArray.push('uu'); } else{ resultArray.push(input[i]); } } } } console.log(resultArray.join('').toUpperCase());