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That's an interesting example, as it's conceptually similar to what Pavel is proposing, but structurally different. gsubfn() is more complicated than a simple switch in the body of the function, and wouldn't work well as an anonymous function. Multiple dispatch can nicely encompass both of these cases. For replace(), library(S7) replace <- new_generic("replace",

This could be extended to sub and gsub as well which gsubfn in the gusbfn package already does: library(gsubfn) gsubfn("^..", toupper, c("abc", "xyz")) ## [1] "ABc" "XYz" On Fri, Mar 3, 2023 at 7:22?PM Pavel Krivitsky <p.krivitsky at unsw.edu.au> wrote: > > Dear All, > > Currently, list= in base::replace(x, list, value)