Credo v1.4.0 Credo.Check.Warning.UnusedStringOperation 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 String module's functions has to be used.
While this is correct ...
def salutation(username) do
username = String.downcase(username)
"Hi #{username}"
end... we forgot to save the downcased username in this example:
# This is bad because it does not modify the username variable!
def salutation(username) do
String.downcase(username)
"Hi #{username}"
endSince Elixir variables are immutable, String 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.