js reverse str case
//Reverse the Case
function reverseCase(str) {
return str.replace(/./g, c => c === c.toUpperCase() ? c.toLowerCase() : c.toUpperCase());
}
console.log(reverseCase("Happy Birthday")); // "hAPPY bIRTHDAY"
console.log(reverseCase("MANY THANKS")); // "many thanks"
console.log(reverseCase("sPoNtAnEoUs")); // "SpOnTaNeOuS"