Dictionary 通过对相同键的值求和在Julia中添加字典

我在茱莉亚有两本字典

a1

和

a2

a1 = {"A"=>1, "B"=>2}
a2 = {"A"=>4, "B"=>1, "C"=>3}

我想把它结合起来得到这个

final={"A"=>5, "B"=>3, "C"=>3}

---

在Python中，我将字典转换为集合计数器，并将它们组合在一起

查看DataStructures.jl计数器

julia> using DataStructures: counter

julia> a1 = Dict{ASCIIString, Int64}("A"=>1, "B"=>2)
Dict{ASCIIString,Int64} with 2 entries:
  "B" => 2
  "A" => 1

julia> a2 = Dict{ASCIIString, Int64}("A"=>4, "B"=>1, "C"=>3)
Dict{ASCIIString,Int64} with 3 entries:
  "B" => 1
  "A" => 4
  "C" => 3

julia> merge(counter(a1), counter(a2)).map
Dict{ASCIIString,Int64} with 3 entries:
  "B" => 3
  "A" => 5
  "C" => 3

---

对于现在看到这个的任何人来说，

计数器

不再是必需的——使用

merge（+，a1，a2）

julia> a1 = Dict("A"=>1, "B"=>2)
Dict{String,Int64} with 2 entries:
  "B" => 2
  "A" => 1
julia> a2 = Dict("A"=>4, "B"=>1, "C"=>3)
Dict{String,Int64} with 3 entries:
  "B" => 1
  "A" => 4
  "C" => 3
julia> merge(+, a1, a2)
Dict{String,Int64} with 3 entries:
  "B" => 3
  "A" => 5
  "C" => 3