Comparison of an imperative bit of code vs. a typical Elixir functional implementation

01_imperative.exs

chunk_size = 50_000

lists =
  Enum.map(0..19, fn x ->
    range_start = x * chunk_size
    range_end = range_start + chunk_size
    Enum.map(range_start..range_end, fn y -> %{data: %{title: "#{y} is love, #{y} is life"}} end)
  end)

Enum.each(lists, fn list -> Repo.insert_all(Meme, list) end)

02_functional.exs

chunk_size = 50_000

1..1_000_000
|> Stream.map(fn x -> %{data: %{title: "#{x} is love, #{x} is life"}} end)
|> Stream.chunk(chunk_size)
|> &(Repo.insert_all(Meme, &1)).()