Julia 1.0 Programming Complete Reference Guide

Ordered dictionaries

If you ever need your dictionaries to stay ordered, you can use the OrderedCollections package (https://github.com/JuliaCollections/ OrderedCollections.jl), specifically the OrderedDict:

pkg> add OrderedCollections 
julia> using OrderedCollections, Dates 
julia> OrderedDict(x => Dates.monthname(x) for x = (1:12)) 
DataStructures.OrderedDict{Any,Any} with 12 entries: 
  1  => "January" 
  2  => "February" 
  3  => "March" 
  4  => "April" 
  5  => "May" 
  6  => "June" 
  7  => "July" 
  8  => "August" 
  9  => "September" 
  10 => "October" 
  11 => "November" 
  12 => "December" 

Now the elements are stored in the order in which they are added to the collection (from 1 to 12).