// A month has five full weekends when it has 31 days, and the 1st day of the month is a Friday.
// ------------------------------------------------------------
// Month names as a single reusable constant
// ------------------------------------------------------------
const monthNames = [
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
];
// ------------------------------------------------------------
// Function: returns true if a month has 5 full weekends
// ------------------------------------------------------------
function hasFiveFullWeekends(year, month) {
// JavaScript months are 0-based, so month is 1–12 but Date uses 0–11
const firstDay = new Date(year, month - 1, 1);
// Get number of days in the month
const daysInMonth = new Date(year, month, 0).getDate();
// JS: Sunday=0, Monday=1, ..., Friday=5, Saturday=6
const weekday = firstDay.getDay();
return (daysInMonth === 31 && weekday === 5); // Friday
}
// ------------------------------------------------------------
// Main program
// ------------------------------------------------------------
function main() {
const y_value = 2026;
for (let m = 1; m <= 12; m++) {
if (hasFiveFullWeekends(y_value, m)) {
console.log(`${monthNames[m - 1]} ${y_value} has five full weekends.`);
}
}
}
main();
/*
run:
May 2026 has five full weekends.
*/
