Conditionally setting one variable's value based on another

Question

I\'ve got a Less variable called @side. What I want is to set the variable @sideOpposite depending on the value of the @side variable.

Answer 1

You can take help of the mixin guard feature to allow conditional mixins

.mixin (@side; @sideOpposite) when (@side = right) { @sideOpposite: left }
.mixin (@side; @sideOpposite) when (@side = left) { @sideOpposite: right }