Hi to all! How I can shadow unused function argume...

# announcements

[Denis A]

Hi to all! How I can shadow unused function argument?

[gildor]

Only by suppressing this warning for this argument or for this function

[gildor]

why do you need this unused argument?

[Denis A]

I set this function on clickListeners

[Denis A]

https://monosnap.com/file/dhkHwJCp5ErSgvOsddTIV1lKEP19FN

[karelpeeters]

Maybe if you call it _?

[Denis A]

I can use lambdas, but (i think) this syntax more friendly and works faster

[gildor]

For click listener it’s different, you can use _ for lamba params, but not for function params

[karelpeeters]

But what if you're implementing an interface for example? Is the warning surpressed automatically then?

[Denis A]

yes, _ , __, _ - reserved words

[gildor]

I would just use lambda instead of adding useless param, imo it’s bad style to add useless params for such case

[gildor]

yes, _ , __, _ - reserved words

For function params, not for lambda arguments

[gildor]

why not just use:
setOnClickListener { logic.okPress() }

[gildor]

yes, method reference is more idiomatic, but if you need add useless param, I would say that it’s become much less idiomatic

[Denis A]

too many brackets)

[gildor]

one more sulution to add custom setOnClickListener extension function without argumentyt

[gildor]

fun View.onClick(action: () -> Unit)

[gildor]

so you can now use it with functions without arguments:
button.onClick(logic::okPress)

[gildor]

or even with the same name:

inline fun View.setOnClickListener(crossinline listener: () -> Unit) {
    setOnClickListener { listener() }
}

[Denis A]

apparently, this is the only way

[gildor]

so now you can use it with method reference without additional changes

[Denis A]

but i add one lambda

[gildor]

No, function is inlined, no overhead in this case

[Denis A]

thanks)