i think this extension function should be part of ...

# announcements

[camkadev]

i think this extension function should be part of Kotlin
fun <T> List<T>.exists(predicate: (T) -> Boolean): Boolean {
return this.firstOrNull(predicate) != null
}
to do things like this
someList.filterNot { p -> anotherList.exists { e -> e.anotherId == t.someId } }

[gildor]

Is this somehow different from existing any extension?

[gildor]

anotherList.any { it.anotherId == t.someId }

[gildor]

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/any.html

[camkadev]

missed 'any' function, yes this is what i'm looking for, thanks

[camkadev]

what i did not understand is why the function is named exactly any if it checks for the existence of an element in the list

[camkadev]

should don't it be named exists ?

[robfletcher]

Returns true if any element matches the predicate

[gildor]

it means ” is there any element in this collection that matches the predicate”

[gildor]

yeah, Rob was faster 🔫

[gildor]

there is also counterpart: none

[camkadev]

ok thanks

[robfletcher]

and all