Feature #18597
Updated by danh337 (Dan H) over 2 years ago
This is related to #16295, but focuses only on the `.+@` part. Currently we can use `.dup` in a method chain when we need to mutate a String. However there are cases where the code's context *expects* the String to be mutated. In cases like this, `.dup` always works, but we don't want to duplicate a String that is already mutable. Since `.+@` looks more like an operator, it can be unintuitive in a method chain, so this is asking for a new named method that can be used in its place, instead of always `.dup`. For example: ``` def add_result_text(buffer, new_result) text = "#{new_result.count} #{new_result.input} #{do_fancy_calc(new_result)}\n" buffer.dup_if_immutable << text # ^^^^^^^^^^^^^^^^ new method? end buffer = "" # ...maybe immutable get_lots_of_results.each do |result| buffer = add_result_text(buffer, result) # In case it was dup'ed end ```