On the use of em dashes. Is it better to omit the spaces between the words and the dash, or is it preferable to separate them with spaces instead?
- No spaces: It's time to take a nap—a long nap.
- With spaces: It's time to take a nap — a long nap.
I've seen both used by good writers — but personally I prefer putting spaces. I'm wondering what are the experts opinion regarding the matter.
P.S. And, most of the time, I use three hyphens in place of it (---), which isn't usual, to my knowledge.