>> > He wants an Arc-style lambda function. Hmph. >> Does it mean that I'll get an Arc-style lambda function eventually, or that >> I'll get an explanation why it's a bad ide— wait, nevermind, I can get >> whatever I want, 'cause it's Racket. Mwa-ha-ha.
>> (I'd still welcome an explanation, tho.) >I don't think saving key strokes in Arc-style fashion is good for >the future reader of my software. But go ahead and re-create the >syntax or borrow it from the Arc implementation (which is some >large Racket macro). In Arc the shorthand for lambdas like [* _ 2] is implemented as a short readtable extension in MzScheme. It expands [* _ 2] to (fn (_) (* _ 2)) at read time, and this is interpreted as Arc code. (It’s only 15 lines of code and most of the code is boilerplate.) Implementation: https://github.com/wting/hackernews/blob/master/brackets.scm One possible idea put this readtable extension (with a few minor tweaks) in a language similar to the at-exp language in Racket ( http://docs.racket-lang.org/scribble/reader-internals.html#%28part._at-exp-lang%29 ). In this way it’d be possible to use the syntax [* _ 2] in any language in Racket. (If this is a good or bad idea, is a mater of taste.) Gustavo ____________________ Racket Users list: http://lists.racket-lang.org/users
