1//Reverse the Case
2function reverseCase(str) {
3 return str.replace(/./g, c => c === c.toUpperCase() ? c.toLowerCase() : c.toUpperCase());
4}
5console.log(reverseCase("Happy Birthday")); // "hAPPY bIRTHDAY"
6console.log(reverseCase("MANY THANKS")); // "many thanks"
7console.log(reverseCase("sPoNtAnEoUs")); // "SpOnTaNeOuS"