Credo v1.4.0-rc.1 Credo.Check.Warning.UnusedListOperation View Source

This check has a base priority of high and works with any version of Elixir.

Explanation

The result of a call to the List module's functions has to be used.

While this is correct ...

def sort_usernames(usernames) do
  usernames = List.flatten(usernames)

  List.sort(usernames)
end

... we forgot to save the result in this example:

def sort_usernames(usernames) do
  List.flatten(usernames)

  List.sort(usernames)
end

List operations never work on the variable you pass in, but return a new variable which has to be used somehow.

Configuration parameters

There are no parameters for this check.

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Link to this section Functions