Less mixin with optional parameters

Question

I have a Less mixin defined as:

.fontStyle(@family, @size, @weight: normal, @style: normal, @color: #ffffff, @letter-spacing: normal) {
  font-f         


        

Answer 1

See the documentation

http://lesscss.org/features/#mixins-parametric-feature-mixins-with-multiple-parameters

Note: you should get in the habit of using semicolons to separate parameters since some css values can contain commas.

Answer 2

To supply a parameter that far down the string of arguments, you have to also supply the expected variable it is to define. So this:

.fontStyle('NimbusSansNovCon-Reg', 12px, @letter-spacing: 0.1em);

Produces this (note how color, font-weight, and font-style used the defaults):

font-family: 'NimbusSansNovCon-Reg';
font-size: 12px;
color: #ffffff;
font-weight: normal;
font-style: normal;
letter-spacing: 0.1em;