def on_change(self, callback: typing.Callable[[T, T], None]) - None:
(fn,ln) ← (getFirstName(bff), getLastName(bff)).tupled in it.
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In the age of on-demand everything, it’s no surprise that we can get "dates" (and I use that term loosely) hot to go with the tap of a button. Thanks to classic hookup apps like Tinder and newcomers like Pure, finding a sexy new friend can be just as easy as ordering a pizza. As for the quality, well, that’s about the same as your pizza — hit or miss, depending on the time of day, where you're located, and how hungry you are.