Are there any generalized functions like joinToString Curren

Question

Are there any generalized functions like joinToString Currently I just need something like a forEach but with a sideeffect between elements

gian · Answer

Something like this ``` zipWithNext forEach a b gt ```

spand · Answer

I cant quite get that to work ie ```listOf 1 2 3 zipWithNext forEach println it first println println it second ``` Gives ```1 22 3```

wasyl · Answer

There s also `Iterable lt T gt joinTo` where you can provide an appendable buffer to put elements into

Czar · Answer

< spand> I m a bit confused what did you want to get instead of ```1 2 2 3```

spand · Answer

1 2 3

Czar · Answer

Oh I see then < wasyl> s answer is correct

spand · Answer

Not really His answer does not take the question into context

spand · Answer

I ended up making my own ```private inline fun lt T gt Iterable lt T gt intersperseEach separator gt Unit = before gt Unit = after gt Unit = action T gt Unit Unit val ite = iterator var first = true before while ite hasNext if first first = false else separator action ite next after ``` Seems like it fits in the stdlib imo

Czar · Answer

Oh I see I m a bit slow today it seems sorry slightly smiling face

spand · Answer

I just wanted to ask if there was another function in the stdlib that was close enough

wasyl · Answer

Yeah I just mentioned another method somewhat relevant to joining But I m curious what s the use case for the method above It just performs some side effects during iteration right

spand · Answer

The current case is printing line separators between elements in kotlinx html ie ``` lt div gt lt div gt lt hr gt lt div gt lt div gt ``` Pretty standard stuff

Kristoffer Andersen · Answer

Maybe flatten it a little I am just golfing now slightly smiling face ``` val ite = iterator before if ite hasNext after return action ite next while ite hasNext separator action ite next after ```

spand · Answer

And since I am not working with strings joinToString is no good

Czar · Answer

```val result = mutableListOf lt String gt val input = listOf 1 2 3 val iter = input iterator iter forEachRemaining result add it toString if iter hasNext result add println result gives 1 2 3 ``` Isn t this what you re looking for then

spand · Answer

Yes that would work

Czar · Answer

```fun lt T gt Iterable lt T gt intersperseEach separator gt Unit = before gt Unit = after gt Unit = action T gt Unit before val iterator = iterator iterator forEachRemaining action it if iterator hasNext separator after listOf lt div gt lt div gt lt div gt lt div gt intersperseEach separator = println lt br gt action = println prints lt div gt lt div gt lt br gt lt div gt lt div gt ```

spand · Answer

<https youtrack jetbrains com issue KT 36647> if anyone wants to watch wink

Czar · Answer

< spand> I m ` Alexander Czar` on YT

Czar · Answer

thanks for the attribution slightly smiling face

spand · Answer

Credit where credit is due

Derek Peirce · Answer

Is there a point to `before` and `after` Those could each be replaced with `also`

spand · Answer

Good point