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How to Get A List Of All Map Keys In Elixir?

2 minutes read

In Elixir, you can get a list of all map keys by using the Map.keys/1 function. This function takes a map as an argument and returns a list of all the keys in the map. For example, you can get a list of all keys in a map named my_map by calling Map.keys(my_map). This will return a list containing all the keys in the map.


What is the most efficient way to obtain all map keys in elixir?

One efficient way to obtain all map keys in Elixir is by using the Map.keys/1 function. This function takes a map as an argument and returns a list of all the keys in that map.


For example:

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my_map = %{a: 1, b: 2, c: 3}
keys = Map.keys(my_map)
IO.inspect(keys)


This will output:

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[:a, :b, :c]



How to handle nested maps while retrieving all keys in elixir?

When dealing with nested maps in Elixir and you want to retrieve all keys, you can use a recursive function to iterate through the nested maps and extract all keys.


Here is an example of how you can achieve this:

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defmodule NestedMapKeys do
  def all_keys(map) do
    all_keys(map, [])
  end

  defp all_keys(map, acc) do
    Enum.reduce(map, acc, fn {key, value}, acc ->
      acc =
        case value do
          %{} = nested_map -> all_keys(nested_map, acc)
          _ -> [key | acc]
        end

      acc
    end)
  end
end

# Example usage
my_map = %{
  key1: "value1",
  key2: %{
    nested_key1: "nested_value1",
    nested_key2: "nested_value2"
  },
  key3: "value3"
}

NestedMapKeys.all_keys(my_map)
# Output: [:key3, :key2, :nested_key2, :nested_key1, :key1]


In this code snippet, the all_keys function recursively iterates through the nested maps and extracts all keys into a list. The function all_keys accepts a map as an argument and an accumulator list acc to store the keys as it iterates through the map. It then checks each value in the map and if it is another map, it recursively calls all_keys on that nested map. If the value is not a map, it adds the key to the accumulator list.


By using a recursive function like the one above, you can easily handle nested maps and retrieve all keys in Elixir.


How to convert map keys to a list in elixir?

In Elixir, you can convert map keys to a list by using the Map.keys/1 function. Here's an example:

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map = %{key1: "value1", key2: "value2", key3: "value3"}

keys_list = Map.keys(map)

IO.inspect(keys_list)


Running this code will output:

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[:key1, :key2, :key3]


This way, you can convert the keys of a map into a list in Elixir.

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