As a potential user of the language I've been toying with using combinators to make compile-time checked DSLs, and this would be enourmously useful.
Rust is still lacking a few features for my proposed use case (varargs and/or kwargs would be fantastic, but I'm already well aware that those are post-1.0 requests). However, I disagree with the idea that it would alienate users. Function composition is useful but not as critical as in a language like Haskell, and aside from the admittedly difficult memory management concepts Rust introduces, it is a very clean and easy-to-understand language, and has far fewer caveats than both C and C++ (at least so far), and much less complexity than academic functional languages. On Wed, Sep 25, 2013 at 3:40 PM, Marvin Löbel <[email protected]>wrote: > We don't use the symbol in our syntax, but are using functional paradigm > that sometimes result in a bit hard to read nested calls. > > I'd propose that it works similar to `do`, in that it allows to move the > last expression of an function or method call after the parentheses, though > they would still remain required for ambiguity reasons: > > ~~~ > a(b(c(1,d(2,3,4,e())))) > == a() $ b() $ c(1) $ d(2,3,4) $ e() > > let v: ~[uint] = from_iter() $ range(0, 100); > ~~~ > > In that sense, it wouldn't really be an operator but syntactic sugar for a > function call. > It might even be possible to replace `do` with it, though the now required > parentheses would make it longer: > > ~~~ > do task::spawn { ... } > task::spawn() $ || { ... } > ~~~ > > Downside is of course that it adds another symbol, which could alienate > more potentiall users, and it could mean a shift-away-from or at least an > inconsistency-with methods and method chaining in general. > > Which would be ironic because I wanted it in some complicated Iterator > chain. ;) > > It could of course always be implemented as a syntax extension, and in any > case I don't expect this to get any attention before Rust 2.0. :) > ______________________________**_________________ > Rust-dev mailing list > [email protected] > https://mail.mozilla.org/**listinfo/rust-dev<https://mail.mozilla.org/listinfo/rust-dev> > -- Andrés Osinski http://www.andresosinski.com.ar/
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