Hey, I found out that this: ``` var columns = listOf<MutableList<EventRect>>() for (even...

# stdlib

[marcinmoskala]

Hey, I found out that this:

var columns = listOf<MutableList<EventRect>>()
for (eventRect in collisionGroup) {
    val properColumn = columns.firstOrNull { column -> !isEventsCollide(eventRect.event, column[column.size - 1].event) }
    if(properColumn != null) {
        properColumn.add(eventRect)
    } else {
        columns = columns.plusElement(mutableListOf(eventRect))
    }
}

is pretty common pattern. Like groupBy, but being in the group depend on other elements in this group. Like elements that are close enough to themself

[voddan]

marcinmoskala: I struggle to comprehend what this code does

[voddan]

Could you please reimplement a simplified version with standard classes? So that it could be run in try.kotlinlang.org

[voddan]

Well I don't have the definition of the EventRect class, that's a problem. Can't you function be demonstrated with Int or String or something similarly simple?

[marcinmoskala]

collisionGroup is group of events that are at the same time. This is finding columns for them the way that two events in the same column are not overlapping

[marcinmoskala]

Like in here

[marcinmoskala]

https://github.com/alamkanak/Android-Week-View

[marcinmoskala]

Groups of events that are in the same time needs to make small columns

[voddan]

OK, nice