Passing a filter to a macro, when the filter includes replaceable parameters

[pmario]

@Yaisog

If I understood the developer discussions correctly, then macros using the $…$ substitution cannot be cached internally, whereas the parameter-as-variable syntax can.

That’s right.

@Yaisog

Personally, I try to avoid the $…$ and $(…)$ substitutions whenever possible.

It is possible to avoid this construction most of the times. But using it for “string” concatenation it is still very convenient and simple to use.