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kotlinlang

Hi there. I have a `Flow` emitting `1`, `2`, `3`. Is there a way to transform this flow to emit: `[1]`, `[1,2]`, `[1,2,3]`. I know there’s this `fold` operator, but it’s terminal. In my case I need a value to be emitted on each accumulation step.  Is there any appropriate operator out-of-the-box?

probably not out-of-the-box, as flow is designed to have minimal operators. you should build your own using `transform`

`scan` operator is close to what you want, but it would include an empty list due to its design

although I suppose you could `scan(...).skip(1)`

```
flow.scan(emptyList&lt;Int&gt;()) { list, value -&gt; list + value }
    .drop(1)
```