Android Kotlin function with multiple optional parameters, call function only with parameters at specific place

Question

So I have this function that has 8 optional parameters (yes I know it's bad practice to have that much, this is legacy code :D).

It goes something like this:

private fun function( rightImage: Int = 0, background: Int = R.drawable.account_item_bg, leftImage: Int = 0, translation: String? = null, name: String? = null, age: String? = null, length: String? = null, duration: String? = null)

Now in my code, I want to call this function and give it only the last parameter (duration). I don't care for other ones.

But at the moment to call this, I Would do it like this:

function(0, R.drawable.account_item_bg, 0, null, null, null, null, 1800)

I was just thinking in the moment of writing this code that it would be cool to have option to send only parameters at the particular place (f.e parameter 6, or last parameter), and not repeat all the optional ones.

Is there maybe option like this, does anyone know? Thanks

function(duration = 1800) should have worked. What error are you getting? — Arpit Shukla
– Arpit Shukla, Commented Oct 11, 2022 at 16:56

Anh Tran · Accepted Answer · 2022-10-11 17:06:04Z

5

This is what you're looking for.

https://kotlinlang.org/docs/functions.html#named-arguments

Example code:

function(duration = "1800")

edited Oct 11, 2022 at 17:06

answered Oct 11, 2022 at 15:55

Anh Tran

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3 Comments

Kratos Over a year ago

This does not work, try it in code. It throws error and asks me to add the first parameter also

Anh Tran Over a year ago

I've just update my example code. So please verify it. @Kratos

Kratos Over a year ago

Yes it works now. Good job!

TheLibrarian · Accepted Answer · 2022-10-11 15:56:46Z

1

You can do it by specifying the argument name.

e.g. function(1, 1, duration = "")

You don't necessarily have to do it for every argument but if you skip some then yes

answered Oct 11, 2022 at 15:56

TheLibrarian

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3 Comments

Kratos Over a year ago

yes I want to do skipping. With this option if I want to send f.e only last parameter, this does not help me. I still have to write all of them before coming to the last one

TheLibrarian Over a year ago

@Kratos Ehm, either you don't or I don't know what you mean. The (1,1... was just an illustration that it's either order or if you don't follow the order, you have to use naming.

Kratos Over a year ago

okay now I got you. I wrongly interpreted it at first. Thank you, I gave you upvote :D

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