glyph class in feature or not

Tanya Davis's picture

I am learning about coding Opentype in Fontlab.
I understand that I can create a Glyph class within a feature or separately.
Is there reason for chosing one over the other?

John Hudson's picture

If you define a class separately, you can re-use that class in other features/lookups. It is also tidier, and easier to review class contents and edit them in the classes panel.

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