How to use variable inside nth selector?

Question

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There are many nth selectors with one value, I want to set it to a variable, for example:
instead of this:

&:nth-child(-n+4) {
            
          }

This:

&:nth-child(-n+@items) {
            
          }

But no matter how I write this variable, everything writes a syntax error. How to use a variable in such selectors?

Answer 1

&:nth-child(-n+@{items}) {
            
}