Nuance of 楽しみにしとくね?


What nuance exactly does bring saying 楽しみに{たのしみに}しとく instead of the more usual
楽しみにしています ? In this context, would the use of しとく(しておく) mean "I rejoice myself
_in advance_ about it" ?

Context : From a friend, referencing a diner we would have together in the
evening of the same day.




The word おく in しておく works to add a nuance "for a period of time."

> 楽しみにしています。
>
> 楽しみにしてます。
>
> 楽しみにしてる。
>
> 楽しみです。
>
> 楽しみ。

These five expressions all mean "I'm excited about it", "I can't wait" or
something like that. These are expressing the present feeling.

The following expressions fundamentally mean the same feeling as those above,
but also express the nuance "for a period of time."

> 楽しみにしておきます。
>
> 楽しみにしておく。
>
> 楽しみにしときます。
>
> 楽しみにしとく。
>
> 楽しみにしとくね。

These five expressions all mean "I'm excited about it, and will be excited
about it for a period of time (maybe, until it happens.)" or something like
that.

The more accurate nuance of this kind of おく is something like "let it be for a
period of time". So, if someone says 「楽しみにしとくね。」, it means that s/he keeps the
feeling 楽しみ and won't change the 楽しみ feeling for a period of time.

These expressions are sincerely used by people in many cases. But sometimes,
people use one of these expressions just in order to be polite, or to put
pressure on someone. I guess your friend said that sincerely.




My dictionary say "しておく" means "ある目的のためにあらかじめある行為を行なうこと(an action for a
purpose in advance). For example, 今日、明日のテストのために英語の勉強をしておく( I study English
today for tomorrow exam.)

I think 楽しみにしておく is a little more friendly and companionable saying than
楽しみにしている but they are almost same meaning.

