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

yes, that

thanks, guys!