Dictionaries can be constructed by passing it any number of pairs.
julia> Dict("A"=>1, "B"=>2)
Dict{String,Int64} with 2 entries:
"B" => 2
"A" => 1
You can get entries in a dictionary putting the key in square brackets.
julia> dict = Dict("A"=>1, "B"=>2)
Dict{String,Int64} with 2 entries:
"B" => 2
"A" => 1
julia> dict["A"]
1