You can use it that way, but you don’t actually invoke the caller, so I don’t see the point in exten...

# getting-started

[rook]

You can use it that way, but you don’t actually invoke the caller, so I don’t see the point in extending the Date class

[zucen.co]

eeeh no sorry intent is to set calendar at the extended day 🙂 so I guess i need to keep this referenco for the original date and can not do lambda right?

[Andreas Sinz]

can you give us an example of input/output should be when you call that function?

[zucen.co]

I would say this is the way.. I mean I always can do in java way but want to d oin right kotlin way 🙂

fun Date.add(calendarUnit: Int, amount:Int): Date = let{
    val calendar = java.util.Calendar.getInstance()
    calendar.time=this
    calendar.add(calendarUnit,amount)
    return calendar.time
}

[Andreas Sinz]

inside the let, the date is both this and it, but its fine like that

[zucen.co]

I meant.. as I wanted it as extension, I need reference to date as this.. but i liked to get callendar into lambda as it but i probably overcomplicate ...

[rook]

You could do

fun Date.add(calendarUnit: Int, amount: Int) {
  return java.util.Calendar.getInstance().apply{
      time = this
      add(calendarUnit, amount)
    }.time
}

[rook]

Although, I don’t know that it’s necessarily easier to read 🤔

[zucen.co]

Yea! ah.. you think so?

[zucen.co]

hmm probaly so... i left it as

fun Date.add(calendarUnit: Int, amount:Int): Date = let{
    val calendar = java.util.Calendar.getInstance()
    calendar.time=this
    calendar.add(calendarUnit,amount)
    return calendar.time
}

[rook]

I have to say, let isn’t giving you any special functionality there. It’s essentially taking up space. You’re not even invoking it, which is the default binding it provides. You can just remove the = let and it functions precisely the same.

[zucen.co]

ok not want to prolongate the pain 🙂 but while getting my way to apply run witht etc... i thought even this as possibly propriate

fun Date.add(calendarUnit: Int, amount:Int):Date =
        Calendar.getInstance().let {
            it.time=this
            it.add(calendarUnit,amount)
            it.time
        }