OrderedDict from OrderedCollections.jl

General Usage
1

I tried merging two OrderedDicts with merge (also with merge!). The resulting dictionary was of type OrderedDict but was not Ordered!!!

2

Can you give an example of the behavior you get and the behavior you expect?

To me it looks OK:

julia> using OrderedCollections

julia> d1 = OrderedDict("a" => 1, "b" => 2)
OrderedDict{String, Int64} with 2 entries:
  "a" => 1
  "b" => 2

julia> d2 = OrderedDict("c" => 3, "a" => 4)
OrderedDict{String, Int64} with 2 entries:
  "c" => 3
  "a" => 4

julia> merge!(d1, d2)
OrderedDict{String, Int64} with 3 entries:
  "a" => 4
  "b" => 2
  "c" => 3

Here all the order in d1 is preserved and the new elements of d2 are added at the end (which makes sense to me since I am inserting them later, via the merge! operation).

3

My two dictionaries were Float64 to Float64.

4

It’s probably worth noting that OrderedDict is ordered by insertion time, not value. You might be looking for a SortedDict.

5

Thank you, that explains it.