If you said length, well, yeah, size does matter. Kinda. But it is more about how you use it, of course!
The dash [ – ], which is created by typing the “minus” key, is used in compound words. Like in the sentence, “Toby is quite good-looking.” Or “Greg is awe-mazing”. You get my drift.
The ndash [ – ], which is created by typing the CTRL + number – or ASCII code “–” (ALT+0150 on number pad) or HTML code “–”, is used between a range of numbers, values or distances. For instance, “Lihsa could easily pass for 30–40 years old!”
The mdash [ — ], which is created by typing ASCII code “—” (ALT+0151 on number pad) or HTML code “—”, is used to set off a phrase or paranthetical—instead of actually using a nerdy pair of parantheses.
Note: you can use two ndashes––or two dashes–in place of the mdash.
But, please, leave out the spaces before and after the mdash. Otherwise, you lose all grammar-street cred if you don’t.
Have a fantabulous grammarous Friday!