Arc's out!
http://arclanguage.org/
Well, that makes the "which language shall I learn next" question rather easier...
First impressions (based on reading the tutorial rather than playing with it): I like it. It embodies PG's philosophy that a language should get out of your way and let you shoot yourself in the foot because one day, you might need to do tarsal surgery and only have a pistol to hand. In many respects, it's the anti-Haskell: it encourages you to put off the decision of how to represent your data as long as possible. Here's a feature along those lines that I liked: indexes into data-structures are indistinguishable from function calls. So if I write
(foo 0) you have no way of knowing if foo is a list, a string or a function. Evaluation is strict by default, which I think is a net loss (but you've got macros, so it's swings and roundabouts, I suppose). The anaphoric (pronoun-introducing) macros from On Lisp are included by default - I've found pronouns to be very useful in Perl, so this can only be a Good Thing. I was amused to see that most of the language is defined in Arc, and that PG seems to think that this is a bold and novel experiment :-)
Well, that makes the "which language shall I learn next" question rather easier...
First impressions (based on reading the tutorial rather than playing with it): I like it. It embodies PG's philosophy that a language should get out of your way and let you shoot yourself in the foot because one day, you might need to do tarsal surgery and only have a pistol to hand. In many respects, it's the anti-Haskell: it encourages you to put off the decision of how to represent your data as long as possible. Here's a feature along those lines that I liked: indexes into data-structures are indistinguishable from function calls. So if I write
(foo 0) you have no way of knowing if foo is a list, a string or a function. Evaluation is strict by default, which I think is a net loss (but you've got macros, so it's swings and roundabouts, I suppose). The anaphoric (pronoun-introducing) macros from On Lisp are included by default - I've found pronouns to be very useful in Perl, so this can only be a Good Thing. I was amused to see that most of the language is defined in Arc, and that PG seems to think that this is a bold and novel experiment :-)