Days_in_the_year.js

// ----------------------------------Description------------------------------

// A variation of determining leap years, assuming only integers are used and years can be negative and positive.

// Write a function which will return the days in the year and the year entered in a string. For example:

// yearDays(2000) returns "2000 has 366 days"
// There are a few assumptions we will accept the year 0, even though there is no year 0 in the Gregorian Calendar.

// Also the basic rule for validating a leap year are as follows

// Most years that can be divided evenly by 4 are leap years.

// Exception: Century years are NOT leap years UNLESS they can be evenly divided by 400.

// So the years 0, -64 and 2016 will return 366 days. Whilst 1974, -10 and 666 will return 365 days.

// ---------------------------------------------------------------------------


const yearDays = (year) => {
   if ((year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0)) {
        return year + " has 366 days";
    } else {
        return year + " has 365 days";
    }
}


console.log('result', yearDays(2000)) //result => 2000 has 366 days