const leapYear = (year) => {

  // Formula to calculate Leap Year

    return year % 400 == 0 || year % 4 == 0 && year % 100 != 0

}

const nextLeapYear = () => {

    let nextLeap = []                    // Declare An Empty Array

    let year = new Date().getFullYear()  // Get Current Year

    while (nextLeap.length < 1){         // While condition to loop until it gets next Leap Year

        if (leapYear(year)){             // If found then push it into the array

            nextLeap.push(year)

        }

        year++                           // else getting upcoming years to check if it's a leap year

    }

    return nextLeap

}

console.log(nextLeapYear().toString())