How do I flatten a map of map of strings in Elixir?

Question

category_urls = [ "https://thepiratebay.org/browse/100/0/3", "https://thepiratebay.org/browse/200/0/3", "https://thepiratebay.org/browse/300/0/3", "https://thepiratebay.org/browse/400/0/3", "https://thepiratebay.org/browse/500/0/3", "https://thepiratebay.org/browse/600/0/3" ] result = category_urls |> Enum.map(fn category_url -> 1..50 |> Enum.map(fn i -> String.replace(category_url, "/0/", "/#{i}/") end) end)

I'm trying to generate a map of urls I need to crawl.

The code above is generating a map of map of strings for me. I'd like to just flatten it to a simple map of strings.

How can I accomplish this in Elixir?

sbs · Accepted Answer · 2016-08-06 05:41:28Z

Use Enum.flat_map/2.

category_urls = [ "https://thepiratebay.org/browse/100/0/3", "https://thepiratebay.org/browse/200/0/3", "https://thepiratebay.org/browse/300/0/3", "https://thepiratebay.org/browse/400/0/3", "https://thepiratebay.org/browse/500/0/3", "https://thepiratebay.org/browse/600/0/3" ] result = category_urls |> Enum.flat_map(fn category_url -> 1..50 |> Enum.map(fn i -> String.replace(category_url, "/0/", "/#{i}/") end) end) end

Though, use comprehension would make the code much simpler.

for i <- 1..6, j <- 1..50, do: "https://thepiratebay.org/browse/#{i}00/#{j}/3"

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