On Tue, May 17, 2011 at 3:20 PM, John Clements <cleme...@brinckerhoff.org> wrote: > > On May 17, 2011, at 12:14 PM, Sam Tobin-Hochstadt wrote: > >> Scala has the nice feature that if you write something like this: >> lst.map(_ - 1) >> It automatically rewrites to a function like this: >> lst.map(x => x - 1) >> This makes writing some higher-order functions much easier. >> >> Of course, it's easy to make this using a macro and `#%app'. You can >> see the result here: >> github.com/samth/fancy-app >> >> I'm planning to put this in `unstable/app', and if there's interest >> I'll think about incorporating it into the default `#%app', after some >> experience with it. >> >> Lots of people have written similar things (`cut' in SRFI 26, Jay's >> `super-cut', etc), but I'd like to move towards using it implicitly. > > Just to clarify (your README is a bit terse ...): this rewrites all > applications where one of the terms is the free identifier '_' . Correct me > if I'm wrong.
This is very close, but wrong in a very important way: the identifier `_' is *bound* by `racket/base' (already). It's treated like a bound keyword by my `#%app' in the same way `else' is treated by `cond'. > I think it's vaguely amusing that the wisdom that we've gained in developing > sophisticated syntactic tools convinces us 90% of the time not to use them. I don't know what you mean here. -- sam th sa...@ccs.neu.edu _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
