.mixin (...) { variadic: true; } .mixin () { zero: 0; } .mixin (@a: 1px) { one: 1; } .mixin (@a) { one-req: 1; } .mixin (@a: 1px, @b: 2px) { two: 2; } .mixin (@a, @b, @c) { three-req: 3; } .mixin (@a: 1px, @b: 2px, @c: 3px) { three: 3; } .zero { .mixin(); } .one { .mixin(1); } .two { .mixin(1, 2); } .three { .mixin(1, 2, 3); } // .mixout ('left') { left: 1; } .mixout ('right') { right: 1; } .left { .mixout('left'); } .right { .mixout('right'); } // .border (@side, @width) { color: black; .border-side(@side, @width); } .border-side (left, @w) { border-left: @w; } .border-side (right, @w) { border-right: @w; } .border-right { .border(right, 4px); } .border-left { .border(left, 4px); } // .border-radius (@r) { both: @r * 10; } .border-radius (@r, left) { left: @r; } .border-radius (@r, right) { right: @r; } .only-right { .border-radius(33, right); } .only-left { .border-radius(33, left); } .left-right { .border-radius(33); }