My editor gave me a note to help me understand the differences between types of dashes when working on my book (see the original here):
- Figure dash “-“
- En-dash “–“
- Em-dash “—“
When to use each:
- Between numbers not indicating a range.
e.g. phone numbers (867-5309).
- Between numbers in a range. e.g. integers from 1–10.
When connecting related words (5–year–old, solid–colored, choke–slam).
- Breaking apart thoughts when a period is too divisive, a comma isn’t enough, and a semi-colon is inappropriate. e.g. “Tedmarius Bifferson walked through the haunted swamp—wait, what was that noise? Oh no! A ghost is killing me! No, not Tedmarius, me! The narrator!”