View Source Credo.Check.Warning.UnusedTupleOperation (Credo v1.7.2-rc.4)

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

Explanation

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

While this is correct ...

def remove_magic_item!(tuple) do
  tuple = Tuple.delete_at(tuple, 0)

  if Enum.length(tuple) == 0, do: raise "OMG!!!1"

  tuple
end

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

def remove_magic_item!(tuple) do
  Tuple.delete_at(tuple, 0)

  if Enum.length(tuple) == 0, do: raise "OMG!!!1"

  tuple
end

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

Check-Specific Parameters

There are no specific parameters for this check.

General Parameters

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.