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kotlinlang

Is there a fancy collections helper method that can help me do this sort of nested for loop when I need to consider each item in a list with the others?

```
for (firstIndex in (0..inputs.size - 2)) {
        for (secondIndex in (firstIndex + 1..inputs.size - 1)) {
            val firstInput = inputs[firstIndex]
            val secondInput = inputs[secondIndex]
            ...
        }
    }
```

Are you doing the Advent of Code by any chance? This came up in today's puzzle.

I did it like this, not sure if there's more elegant ways:
```
val inputs = listOf(3, 4, 5)
inputs.forEachIndexed { index, n -&gt;
    inputs.drop(index+1).forEach { m -&gt;
        println(n * m)
   }
}
```

Yeah, that's where it came up. :slightly_smiling_face:

I've written a `Combinatoric.kt` helper file with several functions because it comes up so often during AoC :smile:

Btw, we're having discussions about Kotlin solutions over at <#C87V9MQFK|advent-of-code> , come join us if you like!