Summary
We've covered quite a lot in this chapter. We started by talking about why you should use the !default flag when defining variables throughout large projects to allow you to create manifest files (or config files) to allow easy customization of your project. From there we moved on to looking at the many issues which can arise from using (or rather misusing) variable scope in selectors, functions, and mixins.
Then we created a mixin for creating CSS arrows. This mixin used extends to reduce repetition in our CSS and allow dynamically including those extends, depending on the direction passed in to the arrow mixin using variable interpolation.
From there we moved on to using the @content directive to allow us to add properties to a mixin. ...
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