Operators overloading

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문제

Implement date arithmetic and support adding years, weeks, and days to a date. You could write the code like this: date + YEAR 2 + WEEK 3 + DAY * 15.

First, add the extension function plus() to MyDate, taking the TimeInterval as an argument. Use the utility function MyDate.addTimeIntervals() declared in DateUtil.kt

Then, try to support adding several time intervals to a date. You may need an extra class.

import TimeInterval.*

data class MyDate(val year: Int, val month: Int, val dayOfMonth: Int)

// Supported intervals that might be added to dates:
enum class TimeInterval { DAY, WEEK, YEAR }

operator fun MyDate.plus(timeInterval: TimeInterval): MyDate = TODO()

fun task1(today: MyDate): MyDate {
    return today + YEAR + WEEK
}

fun task2(today: MyDate): MyDate {
    TODO("Uncomment") //return today + YEAR * 2 + WEEK * 3 + DAY * 5
}

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