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Jina asked twitter for Sass advice the other day. She was working on a bit of code to create a rainbow-striped background gradient using any set of arbitrary colors. This is my solution, in the form of a Sass function. This requires Sass 3.2 (currently in alpha) in order to run.

Stripes Function

Start by setting a variable to the colors you want:

$rainbow: red orange yellow green blue indigo violet;

You could set individual variables for each color as well. You would still pass them all as a single argument, or join them into a single variable before passing, as you see fit.

Here’s the function:

// Returns a striped gradient for use anywhere gradients are accepted.
// - $position: the starting position or angle of the gradient.
// - $colors: a list of all the colors to be used.
@function stripes($position, $colors) {
$colors: if(type-of($colors) != 'list', compact($colors), $colors);
$gradient: compact();
$width: 100% / length($colors);

@for $i from 1 through length($colors) {
$pop: nth($colors,$i);
$new: $pop ($width * ($i - 1)), $pop ($width * $i);
$gradient: join($gradient, $new, comma);

@return linear-gradient($position, $gradient);

And how to use it:

.rainbow {
@include background-image(stripes(left, $rainbow));

Jina has posted a demo and explanation on CodePen.

(The real lesson here is that all the colors of the rainbow are acceptable CSS color keywords. Go forth and queer the web.)