I've never used Nu before, but it's one of the first things I'd consider if I had to build a program on an Objective-C platform.
Let's see....
Here's an interesting overview of some of the syntactic choices and quirky pseudo-conveniences in Nu: http://programming.nu/operators
Nu seems to have a certain selection of symbol-level syntax. (Suffering succotash.) A symbol beginning with * is a rest arg, a symbol beginning with __ becomes a gensym during macroexpansion, and a symbol beginning with @ refers to a class attribute. Objective-C message call syntax like (a sendMessageWithArg:b) seems to be used, and I bet that's part of the reader.
Nu has a seemingly monolithic class definition syntax, which probably compiles straightforwardly to Objective-C classes, but I haven't found documentation about it.
Yes indeedy. And as already mentioned in that thread, I liked the name enough to keep it. I figured that since Arc/Nu is a compiler for the Arc language, rather than a full blown Objective-C/whatever Lisp, the confusion should be fairly minimal...
Incidentally, my new language that I've been steadily working on[1] is called "Nulan" which is short for "Nu language" :P
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* [1]: It's worked for a while now but I still need to get the parser into a good state... turns out, syntax is hard!