SCSS Quantity Queries

@mixin quantity-query( $number, $comparison: 'equal' ) { $nth: ''; @if index( ('greater' 'more' '>'), $comparison ) { $nth: 'n + #{$number}'; } @else if index( ('less' 'fewer' '<'), $comparison ) { $nth: '-n + #{$number}'; } @else if index( ('equal' 'same' '='), $comparison ) { $nth: $number; } @else { @warn "Sorry, that's an invalid $comparison value." } &:nth-last-child(#{$nth}):first-child { &, & ~ * { @content; } } }