I was thinking about what the hello-world of Lisp macros is. It might be something like (mac hello (x) `(set ,x t)) This takes one argument and sets it to t. > (hello foo) t > foo t
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@paulg what about this macro? (defmacro pass-args (code &rest args) `(,@code ,@args)) It takes one argument and “applies” it to the others. > (pass-args (format) t "Hello, World!") Hello, World! NIL > (pass-args (+) 1 2 3) 6 Thanks for the challenge! https://gist.github.com/jorgezaccaro/55cb80fdf939586db58a450c0d87a1a9 …
Can you give an example where you use this macro to write something that would be inconvenient to write without it?
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Not sure atm but I'll look for one. At least that can’t be done with a function, right? I totally forgot about the inconvenience part. This insight came from combining the (+) and ,@ in pages 8 & 164 of your book, (format) only came up later when considering the hello-world macro
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It seems like it can be done with nothing at all, in the sense that e.g. (pass-args (f g) h i j) could always simply be written as (f g h i j)
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