(COMPLETE) Questions on card counting and warning messages...

[BigSpaces]

Hello @BrooklinJazz,

I wonder if we can translate Elixir Compiles into Newbie English Compiles...

warning: variable "acc" is unused (there is a variable with the same name in the context, use the pin operator (^) to match on it or prefix this variable with underscore if it is not meant to be used)
  Documents/GitHub/beta_curriculum/exercises/card_counting.livemd#cell:9

I would be quite sure, looking at the code, that I have indeed used acc... but I am sure there is a reason behind the message.

Thank you!

[BrooklinJazz]

Left a comment about the acc warning. Otherwise, this looks great! Way to apply your new knowledge of reduce to a previous problem.

[BrooklinJazz]

We encountered this today. Remember that we don't rebind the accumulator, the next accumulator will be the return value of our function.

The warning warning: variable "acc" is unused (there is a variable with the same name in the context, use the pin operator (^) to match on it or prefix this variable with underscore if it is not meant to be used) Documents/GitHub/beta_curriculum/exercises/card_counting.livemd#cell:9 occurs because we have bound acc = acc in the return value of our cond statement. We don't then use the bound variable, so Elixir let's us know we are probably doing something wrong.

Try changing the cond statement to resolve the issue.

cond do
  card < 7 -> acc + 1
  card > 9 -> acc - 1
  true -> acc
end

[BigSpaces]

Resolved! Thank you :)