What is the best way to punctuate interrupted dialogue? I have seen it done like this, but I am not sure if it is correct.
"In my opinion the best w--"
"Nobody is interested in your opinion," Fred cut in.
I think that this is called an em dash and that some softwares will put the two hyphens together to make a single, long em dash.
If this is the proper way to signify interrupted speech, is it OK if the software does not join the hyphens into a single em dash. Are two hyphens OK?
If you're writing for a given journal, ask your editor for the house style.
If not, use whatever suits you best but please, don't think there's any proper or best or preferred style…
– Robbie Goodwin Jul 27 '17 at 00:54