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I have a list of numbers:
`val numbers = listOf(1,0,4,0,10,14,16,0,0,34,46)`

how can I transform it in another list where each number is the maximum so far?
 `val numbers = listOf(1,1,4,4,10,14,16,16,16,34,46)`

You can use `runningReduce`: <https://pl.kotl.in/MfM-GN6U1>

<@UUW5Z9XEJ> thanks!
I think I simplified it too much :slightly_smiling_face:
in reality, my list is structured like this:
val numbers = `listOf(obj(1),obj(0),obj(4),obj(0),obj(10),obj(14),obj(16),obj(0),obj(0),obj(34),obj(46))`
it’s a list of objects,
where the number is one of the object properties
how is it possible to apply the same pattern in case of the object?

add a `map { it.value /* or whatever */ }` to get the value out

I got stuck.
I am not sure how to use map in this context

`class MyObj {`
	`val number : Int`
`}`


initial list:

`val = listOf(MyObj(1), MyObj(0), MyObj(4), MyObj(0), MyObj(10), MyObj(14), MyObj(16), MyObj(0),obj(0), MyObj(34), MyObj(46))`


desired list:

`listOf(MyObj(1), MyObj(1), MyObj(4), MyObj(4), MyObj(10), MyObj(14), MyObj(16), MyObj(16), obj(16), MyObj(34), MyObj(46))`

oh, you want to keep the objects, not just the values

<@UUW5Z9XEJ> thanks again!
however I can see that it replaces the whole object and not just the value of the property
(as I would like).
I have added an extra property and you can see it here:
<https://pl.kotl.in/tuvumPXk9>

so which values of the other properties do you want?

I would like to keep the same objects, and only update the single property in the objects

which object do you want the other properties to come from? the first object?

so the “id” properties in the example, should stay the same

as you can see it’s a list of 5 objects, where each object has two properties: value and id
I would like the “id” to stay the same, and only change the “value”

basically, I would like this:
`[I(value=1, id=A), I(value=0, id=B), I(value=4, id=C), I(value=0, id=D), I(value=10, id=E)]`
to become this:
`[I(value=1, id=A), I(value=1, id=B), I(value=4, id=C), I(value=4, id=D), I(value=10, id=E)]`

by running the code I get this:
`[I(value=1, id=A), I(value=1, id=A), I(value=4, id=C), I(value=4, id=C), I(value=10, id=E)]`

that's not what I get with the link above

ok, I did refresh, and it works now, thanks!

Ok, I see, you are using “copy”, so you are actually generating a new object.
For efficiency, it would be ideal to just update the value.

but I am not sure if in Kotlin it’s possible

`runningReduce` doesn't play nice with mutation, and it seems like a bad idea to mutate here