Dictionary values ascending or descending

New to Julia
,
1

Hi,

I have a dictionary of characters and their frequency in a text(or word):

  'H' => 1
  'l' => 2
  'e' => 1
  'o' => 1

and I want to order it by value so:

  'H' => 1
  'e' => 1
  'o' => 1
  'l' => 2

the order of ‘H’, ‘e’ or ‘o’ is irrelevant. It simply needs to be ordered either by ascending or descending value order. Is there a built in function for that?

2 
julia> d = Dict('H' => 1, 'l' => 2, 'e' => 1,'o' => 1)
julia> sort(collect(keys(d)); lt=(a,b)->d[a]<d[b])
4-element Vector{Char}:
 'H': ASCII/Unicode U+0048 (category Lu: Letter, uppercase)
 'e': ASCII/Unicode U+0065 (category Ll: Letter, lowercase)
 'o': ASCII/Unicode U+006F (category Ll: Letter, lowercase)
 'l': ASCII/Unicode U+006C (category Ll: Letter, lowercase)
1 Like
3

my previous reply was not correct, I have edited it but someone pressed the like, hence this one

My use of Revise was interfering

4

You can use the by keyword (and also the rev keyword if you need descending order):

julia> sort(collect(d), by = x -> x.second)
4-element Vector{Pair{Char, Int64}}:
 'H' => 1
 'e' => 1
 'o' => 1
 'l' => 2

julia> sort(collect(d), by = x -> x.second, rev = true)
4-element Vector{Pair{Char, Int64}}:
 'l' => 2
 'H' => 1
 'e' => 1
 'o' => 1
3 Likes
5

Or sort!(collect(d), by=last), which avoids allocating a second array and utilizes last for conciseness.

4 Likes