Hey @mszmurlo values passed to functions are not copied. Values in Elixir are immutable, so no copying needs to occur when a value is passed to a function.
When you say _ = some_var do you mean a variable of _ = some_function_call(x) ? In the case of _ = some_var or even x = some_var no work happens at all and I believe the whole thing is optimized out. Again values are immutable so the runtime doesn’t have two things to deal with when you do x = some_var it just has one thing.
