enpedasi

vers = [%{name: "js", ver: 1}, %{name: "c", ver: 3}, %{name: "elixir", ver: 1.74}]
langs = [%{ id: 1, name: "elixir"}, %{ id: 2, name: "js"}]
langs |> Enum.map( fn rec -> %{ id: rec.id, rec: rec.name, ver: Enum.find(vers, fn v -> v.name == rec.name end)[:ver]} end)