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Call out what happens to duplicate keys in Map.map/2 in the docs #11360

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Nov 3, 2021
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Call out what happens to duplicate keys in Map.map/2 in the docs #11360

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2 changes: 2 additions & 0 deletions lib/elixir/lib/map.ex
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Expand Up @@ -1044,6 +1044,8 @@ defmodule Map do
Maps the function `fun` over all key-value pairs in `map`, returning a map
with all the values replaced with the result of the function.

Duplicated keys are removed; the latest one prevails.

## Examples

iex> Map.map(%{1 => "joe", 2 => "mike", 3 => "robert"}, fn {_key, val} -> String.capitalize(val) end)
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