How would I map over something like this? results = [ {"John Smith", %{"twitter" => "jsmith"}}, {"Lisa Smith", %{"twitter" => "lsmith", "website" => "lsmith.com"}} ] Into something like this new_results = [ %{name: "John Smith", twitter: "jsmith", website: ""}, %{name: "Lisa Smith", twitt…

iex> results |> Enum.map(fn {username, map} = _tuple -> %{name: username, twitter: Map.get(map, "twitter"), website: Map.get(map, "website") } end) [%{name: "John Smith", twitter: "jsmith", website: nil}, %{name: "Lisa Smith", twitter: "lsmith", website: "lsmith.com"}] if You want to avoid nil va…

[image] neuone: results = [ {“John Smith”, %{“twitter” => “jsmith”}}, {“Lisa Smith”, %{“twitter” => “lsmith”, “website” => “ lsmith.com ”}} ] Or perhaps more generically if the keys are variable: defmodule Mapper do @list [ {"John Smith", %{"twitter" => "jsmith"}}, {"Lisa Smith", …

Your solution does not create needed blank keys :slight_smile:

This solution works. Some follow up questions: What does _tuple mean in this context?

it means nothing special, it says {username, map} comes from a tuple which will not be used later. It could be useful if you also want to use this tuple. {u, m} = t is the destructuring notation i could have used this short one without the need of it. iex> results |> Enum.map(fn {u, m} → %{name: …

Ah, good call. Here’s the update: defmodule Mapper do @list [ {"John Smith", %{"twitter" => "jsmith"}}, {"Lisa Smith", %{"twitter" => "lsmith", "website" => "lsmith.com"}} ] @default_keys %{"twitter" => "", "website" => ""} def merge do Enum.map @list, fn {name, map} -> …

def atomize_keys(map) do map |> Enum.map(fn {k, v} → {String.to_atom(k), v} end) |> Enum.into(%{}) end When I see a map into, I am tempted to prefer reduce like this iex> map |> Enum.reduce(%{}, fn ({k, v}, acc) -> Map.put(acc, String.to_atom(k), v) end)

Elixir Programming Language Forum

List with nested maps

Questions & Help Questions

kokolegorille June 5, 2017, 1:53am 4

Your solution does not create needed blank keys