Credo v1.4.0 Credo.Check.Warning.UnusedEnumOperation View Source
This check has a base priority of high and works with any version of Elixir.
Explanation
With the exception of Enum.each/2, the result of a call to the
Enum module's functions has to be used.
While this is correct ...
def prepend_my_username(my_username, usernames) do
valid_usernames = Enum.reject(usernames, &is_nil/1)
[my_username] ++ valid_usernames
end... we forgot to save the downcased username in this example:
# This is bad because it does not modify the usernames variable!
def prepend_my_username(my_username, usernames) do
Enum.reject(usernames, &is_nil/1)
[my_username] ++ valid_usernames
endSince Elixir variables are immutable, Enum operations never work on the
variable you pass in, but return a new variable which has to be used somehow
(the exception being Enum.each/2 which iterates a list and returns :ok).
Configuration parameters
There are no parameters for this check.