[level1] console.log(isEmptyString(”)) // true console.log(isEmptyString()) // false console.log(isEmptyString(null)) // false console.log(isEmptyString(‘ ‘)) // false console.log(isEmptyString(undefined)) // false console.log(isEmptyString(0)) // false console.log(isEmptyString(false)) // false console.log(isEmptyString(‘khaled’)) // false