Number of each unique value in an array

General Usage
2

You can use countmap from StatsBase.jl

julia> using StatsBase

julia> countmap([1, 1, 2, 3, 2, 1, 4, 1])
Dict{Int64, Int64} with 4 entries:
  4 => 1
  2 => 2
  3 => 1
  1 => 4
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