Javascript program to find the longest substring of vowels .
function isVowel ( c ) { return ( c == ' ' c == ' ' c == ' ' c == ' ' c == ' ' ) ; } function longestVowel ( str ) { let count = 0 , res = 0 ; let s = str . split ( " " ) ; for ( let i = 0 ; i < s . length ; i ++ ) {