Credo v1.4.0 Credo.Check.Warning.UnusedFileOperation 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 File module's functions has to be used.
While this is correct ...
def read_from_cwd(filename) do
# TODO: use Path.join/2
filename = File.cwd!() <> "/" <> filename
File.read(filename)
end... we forgot to save the result in this example:
def read_from_cwd(filename) do
File.cwd!() <> "/" <> filename
File.read(filename)
endSince Elixir variables are immutable, many File operations don't 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.