`zipWithNext` will group items together into pairs...

# stdlib

[Shawn]

zipWithNext will group items together into pairs if that works for you

[Dias]

sounds interesting, will have a look at it, thank you

[Dias]

I wish it would zip first and last element with null or something like that as well

[Shawn]

uhh, that’d change your pair type from T to T?, but couldn’t you more or less do that by bolting on a sequenceOf(null) to both ends of your sequence?

[Dias]

yeah, my use case is: I need to map through collection of addresses that have only "move in dates" and produces collection of addresses with "end dates" which we infer from the "move in" date of the next address, problem is with the last address which gets dropped rather than letting me do something with it

[Dias]

appending a null would be one solution I guess

[Dias]

just feels a bit hacky and probably a bit difficult to understand for the next person

[Shawn]

you could pack it into a well-named extension function

[Dominaezzz]

Have you looked at chunked?

[Pavlo Liapota]

Or windowed

[Dias]

hmm that might work actually

[Dias]

actually it doesn’t work because instead of doing say (1,2,3) -> ((1,2), (2,3), (3, null)) it will just do ((1,2), (3))

[Pavlo Liapota]

windowed(2, partialWindows = true)
will return [[1, 2], [2, 3], [3]]
you can use getOrNull(1) to get second item or null
but yeah, this doesn’t look good