so I am trying to add a list of items to a list, t...

# getting-started

[oday]

so I am trying to add a list of items to a list, there’s 1 item that I would like to either add (or not add) according to some flag

[oday]

I would like to be able to do it in 1 go, like

list.addAll(item1, item2, if (flag) item3))

something along those lines, I know it isnt the way to do it but is there an actual way

[ribesg]

list.addAll(listOfNotNull(item1, item2, if (flag) item3 else null))

But don’t do that.

[Joffrey]

There are several options, but it depends on the bigger picture. You said you wanted to add a list of items. Is it an actual List? Because in the snippet you showed it seems you have several variables but not a list to add.

Also, why are you using a mutable list in the first place here? Are you interacting with the mutable list long term? Or is it a temporary object that is then just used as a List? If the latter, buildList { ... } would likely be more appropriate.

[Youssef Shoaib [MOD]]

In fact you could even use takeIf

list.addAll(listOfNotNull(..., item3.takeIf { flag }))

But probably the recommended, and cheaper way to do this is with `buildList`:

buildList(3) { // 3 is the maximum size of things you're going to add
  add(item1)
  add(item2)
  if(flag) add(item3)
}

[oday]

nice!

[oday]

buildList is it! thanks a lot