function removeVowelKeys(obj) { const vowels = ['a', 'e', 'i', 'o', 'u', 'y', 'A', 'E', 'I', 'O', 'U', 'Y']; for (let i in obj) { if (obj.hasOwnProperty(i)) { if (vovels.includes(i[0])) delete obj; } } } const vowelsObj = { alarm: 'This is SPARTA!!!', chip: 100, isValid: false, Advice: 'Learn it hard', onClick: 'make it great again', } removeVowelKeys(vowelsObj); console.log(vowelsObj);