Adding new elements to a Set

Question

How to append a new element to a Set in Julia? For an Array this can be done with append

A = [1, 2, 3] # Array
S = Set(A)    # Set

append!(A, 4) # Works
append!(S, 4) # Does not work

user_7042172 · Answer

Use push! for an unsorted collection

julia> S = Set([1, 2, 3])
Set{Int64} with 3 elements:
  2
  3
  1

julia> push!(S, 4)
Set{Int64} with 4 elements:
  4
  2
  3
  1