function isVowel(char) {
    if (!isString(char)) {
        return false;
    }

    return "aeiou".includes(char.toLowerCase());
}
/**
 * Verifies that a character is a vowel
 * @param {string} char String character
 */
Verifies that a character is a vowel
@param {string} char String character
Verifies that a character is a vowel @param { string } char String character
function isVowel(char) {
    if (!isString(char)) {
        return false;
    }
    return "aeiou".includes(char.toLowerCase());
}
function isVowel ( char ) { if ( ! isString ( char ) ) { return false ; } return "aeiou" . includes ( char . toLowerCase ( ) ) ; }
Verifies that a character is a vowel
 @param {string} char String character
Verifies that a character is a vowel @param { string } char String character