Dashes and Underscores in Variables - SASS

“Why aren’t my variables working properly in SASS/Compass ?”

Well, one of the reasons could be Underscores and Dashes in SASS (and therefor Compass as well). In case you’ve missed it - a little quick tip.

Quick Example

$var-iable: #b4d455;
body {
 background-color: $var_iable;

Compiles to

body {
 background-color: #b4d455;

Say what ?

In SASS it doesn’t matter whether your variable has an underscore or a dash - they work both ways. This is something to be aware about. Trying to get two different variables (one with a dash and the other with the underscore) would be a bad practice anyway, but now you know you actually can’t :)

Mixins, functions too…

This doesn’t apply only to variables. You can define your mixins and functions one way, and call them the other way.

But just because you can, isn’t a good enough reason to start doing that.

But CSS Doesn’t do that…

One might argue, that SASS (SCSS) is aimed to be as close to CSS as possible, and it is. A valid CSS file is a valid SCSS file as well. But dashes aren’t considered the same thing as underscores in CSS!

I think the answer is simple: “some people like underscores, some like dashes”. That’s it.

For example I use underscores most of the time, as it is much, much easier for me to copy-paste variables from one place to another (double-click variable name with underscores, selects the whole variable name, instead of just one part in Sublime Text)

In the end

I think this is actually very useful, as I can (for example) use the whole Compass framework using underscores instead of dashes (which are used by default in Compass), and everything will work properly, as it is meant to.