How do you think would it be useful to have an ext...

# stdlib

[denis090712]

How do you think would it be useful to have an extension function that takes first N elements in a SortedMap?
Something like this:

fun <K, V> SortedMap<K, V>.take(count: Int): SortedMap<K, V> {
    if (size <= count) return this
    val found = keys.elementAt(count)
    return headMap(found)
}

also, it is possible to implement drop function in the same fashion

My case was to take a snapshot of the original tree of depth N.

[spand]

There is no SortedMap in kotlin

[jw]

The stdlib has plenty of extensions on JDK types the same way it also has extensions on JS types and native types

[spand]

Yeah sure. It just seems a few step away to ask for specialized take and drop on a jvm type when they arent present on Map

[Marcin Wisniowski]

They aren’t present on Map because the concept of taking the first 5 elements doesn’t make sense on an unordered map. It makes sense on SortedMap, so it’s a valid request.

[spand]

A Map is no more unordered than a Collection or Set or Iterable which does have a take method.

[Marcin Wisniowski]

Fair point, all the more reason of having it on SortedMap then. Still, it’s probably not a common enough use-case to include in the stdlib.