first(_, n), last(_, n) for Dictionaries

[jariji]

  last(itr, n::Integer)


  Get the last n elements of the iterable collection itr, or fewer elements if itr is not long enough.

Currently last(d, n) returns a Vector but it could return a Dictionary. What do you think?

[jariji]

For example, to get the top 5 values of a dictionary, I sort the dictionary by value and then take the last 5 entries. While retaining the keys as labels.

[jariji]

Maybe like this

Base.first(d::AbstractDictionary, n::Integer) = getindices(d, Indices(Iterators.take(keys(d), n)))

Base.last(d::AbstractDictionary, n::Integer) = getindices(d, reverse(Indices(Iterators.take(reverse(keys(d)), n))))